Engine Management light

[mqm]

I own a 2014 220d A-class.
The engine management light first came on quite a few months ago and then disappeared after a few weeks.
It then recurred and has been on since. Ive given it to a local mechanic who has replaced the parts that the diagnostics has thrown up since but always a new code gets flagged.
Now when I turn the car on the light stays on. I can initially put the car into sport/manual mode put within a few minutes of driving i feel the car drag/jerk for a second and then i can no longer put it into sport/manual and the car becomes slightly sluggish though drives adequately.

Im wondering if anyone else has had such problems.

PS the mechanic got the ECU replaced as he claimed there was moisture in the unit and why it was throwing up various fault codes. But when i went to finally collect it the light immediately came back on and drives exactly as before I gave it to him

I'd appreciate any help as I'm obviously very frustrated as to the cause of the problem.
Thank You!

 

[AMGeed]

Welcome to the forum.

Is your local mechanic a Mercedes specialist?

If not, although your current fault is his responsibility to put right as he hasn't fixed it, I wouldn't go back for any further work.
You should be refunded whatever you paid him last to repair the fault as it obviously didn't work.


Find yourself a good recommended MB indy with Star (Mercedes diagnostics) who can pinpoint your actual fault.
Where are you located so somebody may be able to suggest somewhere?

 

[LostKiwi]

A common mistake is to replace parts because the diagnostic software says something is out of spec with no understanding of what might cause it to be out of spec. In that situation changing the part diagnostics points at doesn't fix it as you've found out.
You don't say where you are but there are a number of very highly respected and knowledgeable specialists who are regulars on the forum. If you live nearish to one of them the trip to get them to look at it would be a sensible route to take next.

 

[John Laidlaw]

^ this. Don’t think I would have left it so long though!

 

[bembo449]

could nearly rebuild the whole sodding car using that train of thought , oh the code says this ! new one fitted and no different , your being fleeced imo , get a refund and go to a decent MB specialist but I wouldn't be surprised if it isn't a power issue , like the alternator or battery , ive noted on my 216 that when I had the battery drain issue the car flattley refused to go between modes on the gearbox

 

[mqm]

he's a local mechanic (not a merc specialist) but he said he has the same diagnostics as the specialists. though i did take it to a merctech after the initial couple failures and their same diagnostic machine gave the same fault codes hence why i went back to my local.
sorry, forgot to say. I'm in Cardiff though i work in Llanelli so Swansea can also be managed

 

[LostKiwi]

he's a local mechanic (not a merc specialist) but he said he has the same diagnostics as the specialists. though i did take it to a merctech after the initial couple failures and their same diagnostic machine gave the same fault codes hence why i went back to my local.
sorry, forgot to say. I'm in Cardiff though i work in Llanelli so Swansea can also be managed

Take it to Steve at Avantgarde in Clevedon. He'll sort it out and it will be the best value trip across the Severn you'll have had.

 

[John Laidlaw]

Oh dear, there seems to be a dearth of Mercedes specialists in your area to be honest.
Closest we all know and respect on here would be Avantgarde in Clevedon but that’s 1.5/2 hours from your locations ... but as I’m writing this LK is suggesting same and worth the trip which I agree with wholly!