Audi A6 Hybrid: Stalling Issues & Fuel System Troubles

This sounds familiar. Had a similar EVAP system issue with my 2019 Audi A4 Hybrid last year, with the check engine light and stalling symptoms matching your description. With moderate experience working on hybrids, I recognized these as classic emission control system problems. The activated charcoal filter was diagnosed as defective, causing irregular pressure sensor readings and affecting the overall air flow. The workshop confirmed this after running comprehensive diagnostics on the EVAP system. The repair took about 4 hours, costing 275 Euro including parts and labor. Since the fix, fuel efficiency improved noticeably and the stalling completely stopped. The check engine light hasnt returned either. To provide more specific advice about your A6, could you share: Current mileage, Any recent repairs or maintenance, Specific fuel efficiency changes youve noticed, Whether the check engine light pattern is steady or flashing, Any unusual smells from the engine compartment This information would help determine if youre dealing with the same root cause or if theres something else going on with your emission control system.

Last service was done at 72085 KM just two weeks ago. After reading multiple threads here and checking similar cases, I think the purge valve might indeed be the culprit. During diagnostics, the mechanic mentioned pressure fluctuations in the EVAP system. Considering the repair costs mentioned and the potential impact on fuel efficiency, I will schedule a follow-up appointment to specifically check the emission control components. The check engine light is steady, and no unusual smells are present. Has anyone else dealt with a failing purge valve on a hybrid system? Looking to understand if this is a common wear item at this mileage.

Thanks for the additional details about your A6. After fixing the activated charcoal filter on my A4, I also discovered the purge valve was showing signs of wear. The steady check engine light combined with the pressure fluctuations in the EVAP system strongly points to a purge valve issue. The air flow problems caused by a failing purge valve typically trigger the check engine light and create those inconsistent pressure sensor readings youre experiencing. On my hybrid, replacing both components resolved similar symptoms completely. Since your last service was recent, its worth noting that EVAP system issues often develop gradually. At around 70000 KM, these components commonly start showing wear in hybrid systems due to the unique pressure cycles they undergo. A few technical notes from my experience: The pressure sensor readings stabilized immediately after repair, Fuel efficiency improved by roughly 12%, The complete EVAP system repair cost 320 Euro, Total repair time was approximately 5 hours Would suggest having both the purge valve and surrounding EVAP system components checked, as they often wear as a set.

Thanks everyone for the helpful responses. I've gathered enough information to move forward with the repair. Based on the pressure fluctuations and the steady check engine light, I'm confident the purge valve needs attention. The leak detection process should confirm if other EVAP system components are also affected. The mileage on my vehicle (72085 KM) seems to align with typical wear patterns for these parts. I'll have the shop do a complete system check to ensure optimal fuel efficiency after repairs. The cost estimates provided here help set realistic expectations for the work needed. Will book the appointment tomorrow and make sure they inspect both the purge valve and the surrounding emission control components. Looking forward to resolving these fuel tank pressure issues and getting rid of the stalling problem.