S205 C250 Engine Management Light!!

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mpc

Active Member
Joined
Mar 12, 2017
Messages
158
Car
2018 S205 C250 AMG LINE PREMIUM D AUTO
The dreaded engine management light came on yesterday while I was driving on the motorway. There was no loss of power and everything seems to be working fine. I reduced my speed to around 55-60 and carried on home. After being parked a while I restarted the engine but the light is still lit.
Is this a case of paying the local garage money to scan for a fault or is there something I can try first?
Thanks
 
The dreaded engine management light came on yesterday while I was driving on the motorway. There was no loss of power and everything seems to be working fine. I reduced my speed to around 55-60 and carried on home. After being parked a while I restarted the engine but the light is still lit.
Is this a case of paying the local garage money to scan for a fault or is there something I can try first?
Thanks
Probably best to find an MB Specialist near you and have it scanned with MB software as that should give you the best chance of a correct diagnosis. Otherwise its a bit of hit and miss!

Ernie
 
Probably best to find an MB Specialist near you and have it scanned with MB software as that should give you the best chance of a correct diagnosis. Otherwise its a bit of hit and miss!

Ernie

As above.

If you're lucky, the code can be erased and won't come back.
 
Having said all that, if yours is a diesel as 'Premium D Auto' might suggest, there's a fair chance it could be NOx sensors but a scan by MB software would easily confirm.

Ernie
 
@ernie @markjay thank you for your replies.
I have it booked in at a local MB specialist (not dealer) in the morning for a scan (67+vat). Fingers crossed its not too serious.
I saw the following on YouTube
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but its didn't do anything on my car.
 
If you are keeping the car for a decent period, buy a scanner, it could and probably will save you ££££££
 
Before turning it off I would like to find out why it turned on in the first place if it was my car.

I always make a note of the error code before erasing it, however on the occasion that I had the EML on a car that was still covered by manufacturer's warranty, they didn't provide any information on the premise that since I wasn't charged for it then I don't need to know. Which I think is wrong, but that's a different story.
 
I always make a note of the error code before erasing it, however on the occasion that I had the EML on a car that was still covered by manufacturer's warranty, they didn't provide any information on the premise that since I wasn't charged for it then I don't need to know. Which I think is wrong, but that's a different story.
Not something that is emphasised in thr "How to" youtube videos.
 
So turns out its the downstream NOx sensor - apparently its on back order from Germany. Ive asked them to order one as it needs replacing. £283.56 for sensor plus 2hrs labour to fit when it arrives pluse the cost of the scan in the first place. Ouch!
 
So turns out its the downstream NOx sensor - apparently its on back order from Germany. Ive asked them to order one as it needs replacing. £283.56 for sensor plus 2hrs labour to fit when it arrives pluse the cost of the scan in the first place. Ouch!

Seems very cheap going by this:
 
Car booked in week after next to get sensors replaced!
 
Sensor has now been replaced and fingers crossed will be ok for a while now!!
£451 all in.
 
I agree with others, you can get decent scan tools for around £50 and they'll read whatever codes are causing the MIL light to come on. I wouldn't encourage deleting the codes since these lights come on for a reason and they'll likely return. Sometimes though it's something you can fix yourself. I had a situation where i'd not refitted the oil cap properly and it caused engine light. Scanner highlighted a code and i figured it out without having to pay a garage a diagnostic fee so thats already paid for the scan tool. I've also fixed other non major issues myself like replacing a PCV valve (on an Audi) saved on diagnostic fee and labour. Glad you've got it sorted though.
 
You're car has the AdBlue system.... fingers crossed, the new NOx sensor will sort it out for good.
 
Car booked in week after next to get sensors replaced!
Good price… I had the sensor replaced August 23 at a MB Franchised dealer just over £760.00 that’s a real ouch !!
 

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