S205 C250 Engine Management Light!!

[mpc]

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

 

[ernie]

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

 

[markjay]

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.

 

[ernie]

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

 

[mpc]

@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.

 

[JHS]

Before turning it off I would like to find out why it turned on in the first place if it was my car.

 

[Benzowner]

If you are keeping the car for a decent period, buy a scanner, it could and probably will save you ££££££

 

[markjay]

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.

 

[markjay]

If you are keeping the car for a decent period, buy a scanner, it could and probably will save you ££££££

^^^^^^^^
This

 

[JHS]

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.

 

[mpc]

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!

 

[JHS]

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!

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Seems very cheap going by this:

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[mpc]

Car booked in week after next to get sensors replaced!

 

[mpc]

Sensor has now been replaced and fingers crossed will be ok for a while now!!
£451 all in.

 

[DamoC43]

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.

 

[markjay]

You're car has the AdBlue system.... fingers crossed, the new NOx sensor will sort it out for good.

 

[Deeman23]

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 !!