Problems with Mercedes A Class Diesel 2008: Black smoke, engine indicator light and DPF regeneration

Hey, I had a similar problem with my 2006 Mercedes A Class diesel. I only have some experience with cars, so I'm not exactly an expert. My problem was also a defective diesel particulate filter. I then went to my local garage and had it repaired there. The repair cost me 1550 euros. It was quite expensive, but afterwards the car ran perfectly again. But to be able to help you more precisely, I would need a few more details: What is your oil level like? Have you recently changed the air filter? How old is your catalytic converter? These details could help to pinpoint the problem more precisely.

(Translated from German)

Hey, thanks for your info. My oil level actually looks pretty good. I actually changed the air filter recently. I can't tell you much about the catalytic converter, but it's still the original one, so it's already as old as the car - just over 13 years. By the way, at my last service at 95239 km nothing special was found. I think I really need to take it to the garage. Thanks for your tip!

(Translated from German)

Hi, I'm glad my tips were helpful. Your catalytic converter could well be the problem. After 13 years of intensive use, deposits can build up inside which disrupt the flow of exhaust gases. This could be a cause of the black smoke. Individual symptoms such as loss of engine power and defective DPF regeneration can also indicate a dirty or damaged catalytic converter. In addition, an old catalytic converter can also increase fuel consumption. I would recommend that you have this checked at a garage. If the catalytic converter is the problem, it will probably need to be replaced. This can be more expensive, but it can also solve many of your problems. You could also ask about cleaning. There are special cleaners for the catalytic converter that can dissolve the deposits. However, these are not always effective and in some cases can even make the problem worse. An expert can give you the best advice. I hope this helps you! Let me know what the workshop says. Keep your fingers crossed that it's nothing serious.

(Translated from German)

Hey, I really appreciate your detailed answer. You've given me a lot of useful information and I feel better prepared now. I also think it's best to have it checked by a professional at the garage. A cleaning sounds interesting, but I'll see what the people at the garage say first. I'll get back to you as soon as I know more. Thanks for your help and fingers crossed!

(Translated from German)

Servus, Have all the sensors been checked to see if they are OK? Often the fault is not the DPF itself but a sensor that prevents regeneration. That's why you should always check first whether all the sensors in the exhaust system are really working properly, this can save a lot of money ;)

(Translated from German)