Audi Q8 TDI Intake Manifold Issues & Repair Guide

Having some experience with diesel engines, I encountered almost identical symptoms on my 2019 Audi Q7 TDI last year. The engine light came on and I noticed similar performance issues, especially the jerking during acceleration and poor fuel economy. My local workshop diagnosed a faulty intake manifold control switch, which was causing improper air distribution in the intake system. They confirmed this by running diagnostics that showed irregular air flow patterns affecting engine performance. The repair involved replacing the intake manifold control unit, which cost 465 Euro including parts and labor. The fix resolved all symptoms completely and restored normal engine performance. The whole process took about 4 hours. Before suggesting specific solutions for your Q8, could you share: Current mileage, Any engine light codes showing, Whether the issues occur more during cold starts, If youve noticed any smoke from the exhaust This information would help determine if your situation matches what I experienced, as intake manifold problems can sometimes present similarly to other issues in these engines.

Thanks for sharing your experience. My Q8 has 122631 KM and had its last service 3 months ago. The engine misfire codes started appearing shortly after, showing P2015 and P2008. The air intake issues happen consistently, not just during cold starts. After reading your post, it seems our symptoms match closely, especially the jerking and hissing from the intake system. The manifold flap appears to be the likely culprit based on the diagnostic codes. My mechanic quoted 520 Euro for the repair including labor, which sounds reasonable compared to your cost. Would be interested to know if anyone else has dealt with similar intake manifold issues in newer TDI engines and how long the replacement parts lasted.

Regarding my previous Q7 repair experience, after 15 months the replacement intake manifold control unit is still working perfectly with no recurrence of symptoms. The P2015 and P2008 codes you mentioned are exactly what I saw, confirming the intake system malfunction. Based on your mileage and timing of issues after service, its worth checking if the airflow control components were properly cleaned during maintenance. Sometimes debris or carbon buildup in the intake manifold can cause flap control problems even with new parts. The 520 Euro quote is reasonable. My repair cost was slightly lower since labor rates vary, but the parts cost should be similar for both our models since they share many intake system components. One tip from my experience: have them check the intake manifold actuator wiring while doing the repair. In my case there was some minor wear that could have caused issues later if not addressed during the fix. The reliability of the replacement parts has been good in my experience. The new generation of TDI intake systems seem more robust than earlier versions, especially when it comes to the flap control mechanisms.

Thanks everyone for the detailed responses. Based on everything shared, I feel more confident about proceeding with the repair. The matching symptoms and error codes, particularly the P2015 and P2008 related to intake manifold flap control, confirm my initial suspicions. The 520 Euro quote seems fair given the scope of work. The reduced power and engine misfire issues are too significant to ignore, and the consistent problems with airflow control need addressing before they potentially cause more damage. Will definitely ask my mechanic to inspect the wiring and check for debris in the intake system during the repair. Planning to book it in next week. Will update the thread after the fix to share my experience and confirm if the symptoms are fully resolved, as this information could help others facing similar intake manifold problems with their TDI engines.