Heavy smoke development and poor performance in Audi A3 diesel - Possible defect in exhaust gas recirculation?

Hello everyone, thank you for your helpful words and advice. I think I now have a better idea of what to expect. I made an appointment with the garage next and addressed the things you mentioned. Luckily everything went well. The mechanics actually found a leaking turbocharger and something with the EGR valve, just like you mentioned. They fixed it all within a short time and were very professional about it. The bill actually ended up being around €650, which is in line with what you mentioned. Not exactly a bargain, but it was worth it. My car is now running perfectly! No more hissing noise, no more smoke, and the warning light is off too. Thanks again for your help, you've really put my mind at rest and helped me a lot. I hope I can help someone else in a similar situation in the future. See you then and stay healthy!

(Translated from German)

Hi, I can understand that you're worried, but I don't think it's anything serious. I have a 2011 Audi A6 and had similar problems some time ago and the same symptoms you just described: heavy smoke, hissing noise, engine without full power and constantly lit warning light. When I went to the garage, they eventually found that my turbocharger was leaking and the EGR valve needed servicing. This would probably also explain your problems with DPF regeneration and the strong exhaust odor, as unburned fuel particles in the diesel enter the engine compartment through the leaking turbocharger. Your assumption about the exhaust gas recirculation could therefore be correct. Your car will probably just need a little maintenance, but it's nothing to worry too much about. Just make an appointment with your garage, they should be able to fix it in no time. Good luck, let us know how it turns out!

(Translated from German)

Hey, thanks for your feedback and reassurance. Your problem does seem to be quite similar. Could you remember how much you had to fork out for the repair back then? And have you had any further problems since then, or was everything back to normal after the repair? I'll give it some more thought before I go to the garage and wanted to ask around a bit here. Thank you in advance!

(Translated from German)

Hey, you're welcome! So after the workshop visit, the problem with the exhaust gas recirculation was actually fixed and didn't come back. That was a real relief. As for the cost, I had to fork out around €435, give or take, to repair the bypass flap that was stuck or defective. It wasn't exactly a bargain, but it just had to be done. And since then my A6 has been running like clockwork, I've had no more problems. You really shouldn't worry too much. Just take it to the garage and see what they say. Good luck and hopefully everything will be sorted quickly!

(Translated from German)

Hi guys, I have to chime in here too. It sounds to me very much like a problem with the exhaust gas recirculation. I've never had the same problem with my car, but I do know a bit about the subject. Exhaust gas recirculation in diesel cars is indeed a critical component and if it fails completely, there is often a lot of smoke and reduced performance - just like yours. At 214587 km, it could simply be that the wear limit has been reached. The function of the exhaust gas recirculation is very dependent on the mileage. As the others have already said, don't panic. But you should definitely have it checked and probably repaired in a workshop. If the problem is there, it could probably cost a bit of money. But that's just the price you pay for a working and environmentally friendly car. Keep us up to date! Good luck and don't give up!

(Translated from German)

It sounds like your Audi A3 might have issues with the turbocharger, EGR valve, or DPF. A diagnostic test at a reputable garage is essential in this case. Costs can vary, but expect significant expenses if major components need replacement. Others might share their repair experiences for better estimates.

It's great to hear that you're considering a professional diagnostic test. This is the best way to accurately identify the issue. Remember, driving with a faulty turbocharger or EGR valve can lead to more serious engine damage. It's best to get it checked out as soon as possible.