Audi A6 EGR Issues: Smoke, Jerks & Power Loss

Had similar issues with my 2017 Audi A3, which turned out to be a faulty EGR valve. The check engine light came on, accompanied by rough idling and poor acceleration. The vehicle emissions were noticeably worse, with dark smoke visible from the exhaust. The EGR valve was completely stuck open, causing excessive exhaust gas recirculation. This led to carbon buildup in the intake manifold, which required thorough cleaning. The problem was significant enough that it could have damaged the catalytic converter if left unrepaired. The fix involved replacing the EGR valve and cleaning the intake system. The repair was rather extensive since carbon deposits had accumulated throughout the intake tract. After the repair, the engine ran smoothly again, fuel economy improved significantly, and the smoke issue disappeared completely. Given your symptoms match closely with what I experienced, recommend having it checked by a specialist. These issues can worsen quickly if not addressed, potentially leading to more serious engine problems. Since your vehicle has low mileage, worth checking if this might be covered under warranty.

Thanks for sharing your experience with the EGR valve issue. The symptoms you described match exactly what I was experiencing with my Audi A6. The rough idle and excessive smoke were really concerning. I took it to a specialist last week and they confirmed it was indeed the EGR valve causing trouble. Would you mind sharing how much you ended up paying for the whole repair? Also curious if youve had any recurring issues with the check engine light or automotive repair problems since getting it fixed? Still a bit worried about potential long-term effects on the engine.

Just picked up my car after getting the EGR valve replaced. Total cost came to 355 Euro which included the new valve and labor. The mechanic found the valve was completely jammed with carbon deposits causing the rough idle and poor performance. Since fixing the exhaust gas recirculation system no more check engine lights or issues. The engine runs perfectly smooth now with no smoke or weird noises. No vacuum leaks or other problems have shown up since the repair two months ago. The catalytic converter was checked and fortunately showed no damage from the faulty EGR valve. Fuel consumption is back to normal too. Regular maintenance and keeping an eye on engine performance should prevent this from happening again. Worth noting these valves can get clogged over time so occasional cleaning helps avoid complete failure.

I finally got my car back from the mechanic yesterday. The EGR valve replacement and system cleaning cost me 430 Euro total. Like many predicted, the valve was completely clogged with carbon buildup, which explained all those issues with the rough running and smoke. The emissions test they ran after the repair showed everything was back to normal. What a relief to see the check engine light finally off. The car runs beautifully now, no more jerking or hissing sounds when accelerating. Fuel consumption has dropped back to normal levels too. Really glad I didn't wait longer to get it fixed. The mechanic mentioned the carbon deposits could have damaged the catalytic converter if left unchecked. Given the car is back to running like new, I'd say it was money well spent, even though the repair cost more than I initially hoped. Definitely learned my lesson about getting strange engine symptoms checked out promptly. Will be keeping a closer eye on the exhaust gas recirculation system during future services to catch any issues early.