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GLC Issues

hallra

Active Member
Joined
Jan 24, 2017
Messages
137
Car
Mercedes
Hi,

I have a large number of issues with my GLC, the car has gone into the garage several times, with none of the issues being corrected.

The Mercedes garage has just shugged their shoulders and done nothing.

I've escalated to Mercedes central customer services, had difficulty with them taking any ownership, just fobbing me off, when I asked to speak to a manager, I had to really push hard before I got anywhere.

The customer services manager just told me, that yes they are aware the product has limitations (issues) but why would they tell their customers about them... They were not concerned about anything and didn't careless that I had spent an awful large amount of money on a car, which has numerous problems...

I've now had 2 accidents in this car, once when the parking sensors failed to warn me of an object behind me, the 2nd when the front wheels lost grip at low speed.
- I've been driving for 30 years and have an immaculate record!

I'm astonished that such a prestiage car has so many issues!


Here is the list:

Media
-------
No Apple Carplay, though I was told by sales person the car would have.
Sometimes loses ability to change track, have to go to iPhone.
Sometimes pauses song and have to go to iPhone to restart.
Often switches to music held on iPhone and plays ABBA song.
Pauses on Bluetooth for unknown reason.
Autoplays when plug into Media Interface.
Playing song on media interface, change song on steering wheel gave me same song again, on centre console, it switched to next song. At some point it switches to ABBA song.
Sometime displays 1/4455, even when playing from Spotify or Apple Music.
Display of song name gets truncated.
Internet browsing extremely slow.
Changing between media sources, initial volume extremely high.
Video Playback doesn’t work.
No TV.

Gearbox
---------
Car often jolts when engaging and changing 1st & 2nd gears

Adaptive Cruise Control
--------------------------
Braking jerks the car when it comes to a full stop.
Sometime when accelerating from low speed it uses high revs to accelerate when it isn’t necessary.
In traffic when it brakes, it does so slowly then too hard, like it isn’t detecting the traffic is slowing down until last minute then brakes hard. Looks like the system is too slow to detect and to react.
The other day, approaching traffic that had stopped, at distance of 150-150 metres the car speeds up from 20 to 40mph, then at last minute, some 2 secs later it breaks hard because it suddenly sees the stopped traffic.
When I have used the brakes/accelerator to turn off/suspend it, I can find that the cruise control can switch back on when I am slowing down, causing the car to accelerate, this has caused dangerous situations.
It's accelerating and braking like it sports mode.
When setting speed on adaptive cruise control, speed set isn’t being displayed. On C class the speed set is displayed.
The adaptive cruise control accelerates going around bends which is dangerous.

Pre-Braking
-------------
The car keeps pre-braking when it shouldn’t be, creating dangerous situations, which I as driver have no control over.
On one occasion, the car when engaging emergency brake stalled the engine. The emergency brakes again came on when it shouldn’t have.

Sensors
---------
Blind spot sensors can't deal with normal traffic, continually going off.
The too close to the car in front warnings are delayed by 1.5 secs.
The defaults for assistance (pre-brake, blind spot, ECO start/stop etc) are ‘always on’ and doesn't stay ‘off’ when turned off and then engine switched off. On restarting car all settings forgotten.
Emergency brake alarm, blind spot alarm, parking sensors are continually going off whilst driving.
On one occasion, the reverse camera didn’t come on once when I was reversing.
Parking sensors spordically work, caused accident.

Navigator
The Navigator makes some bad/strange decisions for directions, it gets arrival timings very very wrong and doesn't display previous destinations correctly.

Tyres
M25 between J8 and J7, horrendous resonant noise when road is concrete, I thought car might fall apart!
Turning full lock on steering, noises coming from suspension.

Parking
While moving the car allowed me to engage ‘park’ when I accidently pressed the park button.

Stop/Start Function
On one occasion, break peddle became very stiff and I lost breaks when the engine switched off, car started rolling.
 
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I think this litany looks a bit OTT. You've taken against the car and inflated the number of issues.

As an example:

The issue of cruise control accelerating round a corner - I'm guessing what is actually happening is that it is increasing engine output to maintain constant speed - but because you're subconciously used to the car slowing down on a bend the increased engine output and lack of deceleration seems like something is wrong. This sort of effect is particularly pronounced on a slight uphill bend.
 
Media
-------
No Apple Carplay, though I was told by sales person the car would have.
Sometimes loses ability to change track, have to go to iPhone.
Sometimes pauses song and have to go to iPhone to restart.
Often switches to music held on iPhone and plays ABBA song.
Pauses on Bluetooth for unknown reason.
Autoplays when plug into Media Interface.
Playing song on media interface, change song on steering wheel gave me same song again, on centre console, it switched to next song. At some point it switches to ABBA song.
Sometime displays 1/4455, even when playing from Spotify or Apple Music.
Display of song name gets truncated.
Internet browsing extremely slow.
Changing between media sources, initial volume extremely high.
Video Playback doesn’t work.
No TV.
If you were told it had TV and Video playback, and Appleplay, then I can see you being dissapointed. However I never expected it to have any of those, and I read all the public advertising stuff extensively prior to purchase, I don't recall that being in there. I did buy mine over a year ago mind you.

The rest of you list are issues, but I either haven't come across them or they don't unduely annoy me. Internet browsing...I tried it once, I really have no need to browse the internet using my car. Song sequencing does at time appear to be all over the place.

Gearbox
---------
Car often jolts when engaging and changing 1st & 2nd gears
I've not noticed that. I have noticed that the car's reaction to accelarator travel can be terrible.

Adaptive Cruise Control
--------------------------
I don't have that so I can't comment

Pre-Braking
-------------
The car keeps pre-braking when it shouldn’t be, creating dangerous situations, which I as driver have no control over.
On one occasion, the car when engaging emergency brake stalled the engine. The emergency brakes again came on when it shouldn’t have.
Clearly you have some of the optional safety packs, I don't. I have noticed that the granny "you are too close to the car in front" light/noise often comes on incorrectly...sometimes due to a traffic island in the middle of the road, sometimes at 15/20 MPH approaching a really tight bend on an old walled narrow bridge where it thinks I'm not going to turn in time, and sometimes when a car in front of me is turning left off the road WELL before I am going to get there. Haven't had it activate the brakes though.

A car activating emergency braking when evidently not necessary/expected is a safety concern IMO.


Sensors
---------
Blind spot sensors can't deal with normal traffic, continually going off.
The too close to the car in front warnings are delayed by 1.5 secs.
The defaults for assistance (pre-brake, blind spot, ECO start/stop etc) are ‘always on’ and doesn't stay ‘off’ when turned off and then engine switched off. On restarting car all settings forgotten.
Emergency brake alarm, blind spot alarm, parking sensors are continually going off whilst driving.
On one occasion, the reverse camera didn’t come on once when I was reversing.
Parking sensors spordically work, caused accident.
I don't have blind spot stuff.
My reverse came didn't come on a couple of occasions, and failed to deactivate once or twice...no biggie.
I haven't had any issues with the sensors
 
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MB seem to have got something very wrong with this model.

I wonder if it's a problem with concept, design, manufacture, or marketing?
 
MB seem to have got something very wrong with this model.

I wonder if it's a problem with concept, design, manufacture, or marketing?

General cost cutting more like.

Anybody know where these are built?
 
I think this litany looks a bit OTT. You've taken against the car and inflated the number of issues.

As an example:

The issue of cruise control accelerating round a corner - I'm guessing what is actually happening is that it is increasing engine output to maintain constant speed - but because you're subconciously used to the car slowing down on a bend the increased engine output and lack of deceleration seems like something is wrong. This sort of effect is particularly pronounced on a slight uphill bend.

Hi,

Yes I agree it looks OTT, but the issues are genuine, some I could live with, some are damn annoying, but some are damn right dangerous.

- The issue you've quoted is not a increase in engine output to maintain speed, it actually accelerates on bends, it also accelerates at stationary cars.

I posted the issue list because a car of this price/prestiage should not be having any of these issues and Mercedes response is not good enough.

I'm interested if other people have these issues and it is a warning for others thinking of purchasing the car.
 
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If you were told it had TV and Video playback, and Appleplay, then I can see you being dissapointed. However I never expected it to have any of those, and I read all the public advertising stuff extensively prior to purchase, I don't recall that being in there. I did buy mine over a year ago mind you.

The rest of you list are issues, but I either haven't come across them or they don't unduely annoy me. Internet browsing...I tried it once, I really have no need to browse the internet using my car. Song sequencing does at time appear to be all over the place.

I've not noticed that. I have noticed that the car's reaction to accelarator travel can be terrible.

I don't have that so I can't comment

Clearly you have some of the optional safety packs, I don't. I have noticed that the granny "you are too close to the car in front" light/noise often comes on incorrectly...sometimes due to a traffic island in the middle of the road, sometimes at 15/20 MPH approaching a really tight bend on an old walled narrow bridge where it thinks I'm not going to turn in time, and sometimes when a car in front of me is turning left off the road WELL before I am going to get there. Haven't had it activate the brakes though.

A car activating emergency braking when evidently not necessary/expected is a safety concern IMO.


I don't have blind spot stuff.
My reverse came didn't come on a couple of occasions, and failed to deactivate once or twice...no biggie.
I haven't had any issues with the sensors


Hi,

thanks for your comments.

The Apple Carplay was promised, i've been told by a service foreman at the local Merc dealer that the confusion comes from the garages being told that the car was getting Apple CarPlay and then being told it wasn't.

- I purposefully purchased the larger screen for this purpose.

I've asked for the safety pack to be turned off as I agree with you that it's a safety issue... Mercedes response... we can't/won't turn off safety systems!


The trouble I've had is having Mercedes even acknowledge any of these issues, let alone fix them, a manager in the customer services team just told me that Merecedes are aware of limitatiosn (issues) with their product but they don't let their customers know this information.
 
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The issue you've quoted is not a increase in engine output to maintain speed, it actually accelerates on bends, it also accelerates at stationary cars.
I'm not saying you don't have a problem with your particular car, but have you read the instruction manual, and in particular the section about limitations of the Distronic system's capabilities?

I ask because what you describe are the very behaviours my E63 manual warns may occur, and indeed in certain circumstances my car does exactly the same. So did my previous E63 which was also fitted with Distronic.
 
I'm not saying you don't have a problem with your particular car, but have you read the instruction manual, and in particular the section about limitations of the Distronic system's capabilities?

I ask because what you describe are the very behaviours my E63 manual warns may occur, and indeed in certain circumstances my car does exactly the same. So did my previous E63 which was also fitted with Distronic.

Hi Phil,

yep agree with you about some of this is described in the instruction manual, in it's difficult to read electronic format.

But, how often do we get to read the instruction manual when purchasing a car?

You do not have access to the instruction manual, so it's sort of 'closing the stable door after the horse has bolted'... It's too late then...

I also find the instruction manual with many caveats to protect Mercedes, like with the parking sensors... Be aware of your surroundings before attempting to manoeuvre, not all objects are seen... What is the point of parking sensors if they can't detect? I hit a very large skip because the sensors failed to notice it! :)

I got sensors because I can't turn my neck properly, so I rely on them! :)
 
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Hi Hallra,

Always a shame when you have completed your happy purchase and then are disappointed with it.

I've tried to collect my thoughts.

Hi,

I have a large number of issues with my GLC, the car has gone into the garage several times, with none of the issues being corrected.

The Mercedes garage has just shugged their shoulders and done nothing.
Unfortunately that has been my experience as well since owning my GLC43 AMG. I've had 3 very good years in my Mercedes GL and they bend over backwards for me. But they don't seem to want to know me at all know.

I've escalated to Mercedes central customer services, had difficulty with them taking any ownership, just fobbing me off, when I asked to speak to a manager, I had to really push hard before I got anywhere.
Yup, unfortunately my experience as well.

The customer services manager just told me, that yes they are aware the product has limitations (issues) but why would they tell their customers about them... They were not concerned about anything and didn't careless that I had spent an awful large amount of money on a car, which has numerous problems...
It is that that annoys me above anything else. They don't seem to get that they have that job because consumers like us by the products. That is where the money is coming from. But somehow they forget it.

I've now had 2 accidents in this car, once when the parking sensors failed to warn me of an object behind me, the 2nd when the front wheels lost grip at low speed.
- I've been driving for 30 years and have an immaculate record!
Ouch that is no good. To be fair, sensors aren't fool proof, they never are and will only give and indication. Nevertheless I fully appreciate how annoying that must be.


Media
-------
No Apple Carplay, though I was told by sales person the car would have.
Sometimes loses ability to change track, have to go to iPhone.
Sometimes pauses song and have to go to iPhone to restart.
Often switches to music held on iPhone and plays ABBA song.
Pauses on Bluetooth for unknown reason.
Autoplays when plug into Media Interface.
Playing song on media interface, change song on steering wheel gave me same song again, on centre console, it switched to next song. At some point it switches to ABBA song.
Sometime displays 1/4455, even when playing from Spotify or Apple Music.
Display of song name gets truncated.
Internet browsing extremely slow.
Changing between media sources, initial volume extremely high.
Video Playback doesn’t work.
No TV.
No Apple CarPlay - yes no good if they told you it had, however that is why there are order spec sheets. You really got to check that they've done their job correctly when you sign on the dotted line.
Which iPhone do you use? I had similar on my wife's old 5S, but when we switched to the 7 and 7 Plus we have no more of those issues to change track etc. Another theory I have (but haven't proven it) is to do with how Apple Music and Apple Match is configured and whether you allow music browsing that isn't on the phone, and whether you have weak data connections. I think that causes that effect as well.

Yes if you plug it in the cable, it will autoplay the Media Interface. It is a feature. I don't like it either, but my GL did the same. For me it is always the stupid Ed Sheeran song beginning with A ;)

I recall those iPhone issues, but haven't had any of them on the iPhone 7.

Internet Browsing is just a gimmick, perhaps good if you are a chauffeur and waiting but otherwise I just use my phone.

Have not experience the initial volume being high.

DVD Playback works, but no video from a phone no but to be fair it doesn't say so in any of the literature.

TV no, but DVD you can play. Again I just use my phone. I wouldn't pay for the TV, to rubbish on the move anyway.

Gearbox
---------
Car often jolts when engaging and changing 1st & 2nd gears
Insist they look at this, I think there is a software update for that. Which car do you have?

Adaptive Cruise Control
--------------------------
Braking jerks the car when it comes to a full stop.
Sometime when accelerating from low speed it uses high revs to accelerate when it isn’t necessary.
In traffic when it brakes, it does so slowly then too hard, like it isn’t detecting the traffic is slowing down until last minute then brakes hard. Looks like the system is too slow to detect and to react.
The other day, approaching traffic that had stopped, at distance of 150-150 metres the car speeds up from 20 to 40mph, then at last minute, some 2 secs later it breaks hard because it suddenly sees the stopped traffic.
When I have used the brakes/accelerator to turn off/suspend it, I can find that the cruise control can switch back on when I am slowing down, causing the car to accelerate, this has caused dangerous situations.
It's accelerating and braking like it sports mode.
When setting speed on adaptive cruise control, speed set isn’t being displayed. On C class the speed set is displayed.
The adaptive cruise control accelerates going around bends which is dangerous.
In my experience it doesn't control the gearbox, it controls the throttle. If you have the gearbox in Sport or Sport+ then yes it will hold on to the revs. But to be fair I don't think any of the other points are actual issues. I accelerate going around bends all the time. Heck in the Golf R my favourite is going onto the M1 from staples corner whilst using launch control :)

Pre-Braking
-------------
The car keeps pre-braking when it shouldn’t be, creating dangerous situations, which I as driver have no control over.
On one occasion, the car when engaging emergency brake stalled the engine. The emergency brakes again came on when it shouldn’t have.
Stalled the engine? On an automatic? See my earlier point, it sounds like you need that software update.

If it keeps pre-braking in an invasive manner and your car is new, I'd insist they check out the alignment of the system. Perhaps it is knocked out of place. Hey perhaps even the windscreen has already been replaced and they didn't do the alignment of the system. Worth persisting on that point and invite them for a test drive.

Sensors
---------
Blind spot sensors can't deal with normal traffic, continually going off.
The too close to the car in front warnings are delayed by 1.5 secs.
The defaults for assistance (pre-brake, blind spot, ECO start/stop etc) are ‘always on’ and doesn't stay ‘off’ when turned off and then engine switched off. On restarting car all settings forgotten.
Emergency brake alarm, blind spot alarm, parking sensors are continually going off whilst driving.
On one occasion, the reverse camera didn’t come on once when I was reversing.
Parking sensors spordically work, caused accident.
Let's be short about that one, it shouldn't be doing that. I wonder whether your car had delivery damage and they 'fixed' it but didn't do some realignment of those sensors.

Navigator
The Navigator makes some bad/strange decisions for directions, it gets arrival timings very very wrong and doesn't display previous destinations correctly.
Which system do you have? The full Mercedes Command Online or the SD Card one? Very different experience to me, I like it so much together with the live internet traffic that I leave Waze off and just use the inbuilt system. It is very correct, very good including previous destinations. I find that especially strange as why wouldn't it do that on one car but does do it correctly on another.
Tyres
M25 between J8 and J7, horrendous resonant noise when road is concrete, I thought car might fall apart!
Turning full lock on steering, noises coming from suspension.
You don't state what model you have and on what tyres. But in my opinion there is something seriously wrong in the setup as I agree it isn't just in crabbing it is also on bad road surfaces. Sure I accept this is only a GLC and not the same comfort level as my GL was but on the bad road surface it can get very bad. I forgive it a little as I upgraded to 21" wheels.

Parking
While moving the car allowed me to engage ‘park’ when I accidently pressed the park button.
Weird, that is just plain weird. Did you have you foot brake engaged?

Stop/Start Function
On one occasion, break peddle became very stiff and I lost breaks when the engine switched off, car started rolling.
What seriously? You didn't switch off the car? You didn't apply hold? You were doing what exactly? Surely not holding your foot on the brake pedal and then feeling it push up and off?

Man oh man, it sounds like your car is possessed. I don't think you need a mechanic but a Catholic priest instead :P
 
Hi Hallra,

Always a shame when you have completed your happy purchase and then are disappointed with it.

I've tried to collect my thoughts.


Unfortunately that has been my experience as well since owning my GLC43 AMG. I've had 3 very good years in my Mercedes GL and they bend over backwards for me. But they don't seem to want to know me at all know.


Yup, unfortunately my experience as well.


It is that that annoys me above anything else. They don't seem to get that they have that job because consumers like us by the products. That is where the money is coming from. But somehow they forget it.


Ouch that is no good. To be fair, sensors aren't fool proof, they never are and will only give and indication. Nevertheless I fully appreciate how annoying that must be.



No Apple CarPlay - yes no good if they told you it had, however that is why there are order spec sheets. You really got to check that they've done their job correctly when you sign on the dotted line.
Which iPhone do you use? I had similar on my wife's old 5S, but when we switched to the 7 and 7 Plus we have no more of those issues to change track etc. Another theory I have (but haven't proven it) is to do with how Apple Music and Apple Match is configured and whether you allow music browsing that isn't on the phone, and whether you have weak data connections. I think that causes that effect as well.

Yes if you plug it in the cable, it will autoplay the Media Interface. It is a feature. I don't like it either, but my GL did the same. For me it is always the stupid Ed Sheeran song beginning with A ;)

I recall those iPhone issues, but haven't had any of them on the iPhone 7.
- I have iPhone 6 with all the latest updates applied.

Internet Browsing is just a gimmick, perhaps good if you are a chauffeur and waiting but otherwise I just use my phone.
- Yep agreed it's a gimmick, but in this day and age it shouldn't be, it should work.

Have not experience the initial volume being high.
- Switching between media sources, it doesn't adjust the sound, so if the volume on iPhone is low and you turn it up and the switch to radio, it blasts the sound out.

DVD Playback works, but no video from a phone no but to be fair it doesn't say so in any of the literature.
- In this day and age it should work, the literature if I remember just says video play back.

TV no, but DVD you can play. Again I just use my phone. I wouldn't pay for the TV, to rubbish on the move anyway.


Insist they look at this, I think there is a software update for that. Which car do you have?

GLC 250 d 4MATIC AMG Premium Plus 20" AMG Alloys, Driving Assistance,

In my experience it doesn't control the gearbox, it controls the throttle. If you have the gearbox in Sport or Sport+ then yes it will hold on to the revs. But to be fair I don't think any of the other points are actual issues. I accelerate going around bends all the time. Heck in the Golf R my favourite is going onto the M1 from staples corner whilst using launch control :)

- It was in comfort mode, Yeah of course I will accelarate in a corner, I like to drive :) But, the big BUT, I can see what the corner is doing and the traffic situation, I have control.

I've had it accelerate around sharp bends, at stationary traffic, situations where unless you are a nutty boy racer, you wouldn't do it... You would expect a automated system to take caution, not drive like an idiot :)

Stalled the engine? On an automatic? See my earlier point, it sounds like you need that software update.
- Garage has apparently applied all the software updates.

If it keeps pre-braking in an invasive manner and your car is new, I'd insist they check out the alignment of the system. Perhaps it is knocked out of place. Hey perhaps even the windscreen has already been replaced and they didn't do the alignment of the system. Worth persisting on that point and invite them for a test drive.
- Not heard of this one, worth pursuing.

Let's be short about that one, it shouldn't be doing that. I wonder whether your car had delivery damage and they 'fixed' it but didn't do some realignment of those sensors.
- Interesting.

Which system do you have? The full Mercedes Command Online or the SD Card one? Very different experience to me, I like it so much together with the live internet traffic that I leave Waze off and just use the inbuilt system. It is very correct, very good including previous destinations. I find that especially strange as why wouldn't it do that on one car but does do it correctly on another.
- Premium Plus, so Command Online. I think its because I live in London and it can't deal with the amount of traffic. I missed a hospital appointment because it got it wrong, now I have google maps on the phone all the time and ignore the car when it gives wrong/bad directions.

You don't state what model you have and on what tyres. But in my opinion there is something seriously wrong in the setup as I agree it isn't just in crabbing it is also on bad road surfaces. Sure I accept this is only a GLC and not the same comfort level as my GL was but on the bad road surface it can get very bad. I forgive it a little as I upgraded to 21" wheels.
- 20" AMG Alloys

Weird, that is just plain weird. Did you have you foot brake engaged?


What seriously? You didn't switch off the car? You didn't apply hold? You were doing what exactly? Surely not holding your foot on the brake pedal and then feeling it push up and off?
- The ECO start/stop function turned the engine off whilst I was in a queue for Mcdonalds, I didn't pay attention as the road was flat until it started to roll...

Man oh man, it sounds like your car is possessed. I don't think you need a mechanic but a Catholic priest instead :P

I'd agree, think it is possessed, the wife won't touch the car she hates it :fail
 
i'm obviously not good at this forum stuff, dejongj your post looks very smart with all the quotes... I just failed badly with mine...
 
I'd agree, think it is possessed, the wife won't touch the car she hates it :fail

Of course compounded by the fact that you're unhappy with it too. All in all not good to say the least.

Since it's go to this stage for both of you, may it's best to consider changing it. Life is too short and there's very possibility you'll never be happy with the car or another of this particular model.
 
Of course compounded by the fact that you're unhappy with it too. All in all not good to say the least.

Since it's go to this stage for both of you, may it's best to consider changing it. Life is too short and there's very possibility you'll never be happy with the car or another of this particular model.
Have to agree with you.

However, the overriding factor when I purchased the car was that it was the only car I could find that had a seat and seating position that was not too painful for me, unfortunately I have a very bad arthritic condition called Ankylosing Spondylitis.

I tried many many cars, all the major manufacturers, the only ones I haven't tried are the new F-Pace and the Macan, it has to be an SUV as I can't get in and out of a Salon without difficulty.


So changing isn't simple for me. [emoji85]



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This may sound daft, but an SL I borrowed for a while, when it was totally filthy showed some strange behaviour with the various assist features as distronic. Various cameras and radar can be affected by snow and mud etc.

Btw, you can turn off all of the safety assist features in the vehicle settings menu.
 
Well, on the bright side it's good excuse to have a look at the Jag & Porsche.
 
This may sound daft, but an SL I borrowed for a while, when it was totally filthy showed some strange behaviour with the various assist features as distronic. Various cameras and radar can be affected by snow and mud etc.

Btw, you can turn off all of the safety assist features in the vehicle settings menu.
I wish washing the car was the answer [emoji87]

Yep, you can turn them off, but they come back on again after switching engine off/on, apart from the blind spot that one stays off... I rarely use distronic now, apart from when the legs/feet are really painful.

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So whilst I ended on a light note there was a very serious message amidst. To me it sounds like your car is not right and requires a full alignment. I've had this on the Golf R once and the radar system had to be realigned as it was somehow knocked out. About £500 of alignment later and it has been fine since.
 
So whilst I ended on a light note there was a very serious message amidst. To me it sounds like your car is not right and requires a full alignment. I've had this on the Golf R once and the radar system had to be realigned as it was somehow knocked out. About £500 of alignment later and it has been fine since.
Thanks for the advice, I'll ask Mercedes garage to look into this


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