Audi Q5 Hybrid Misfire: Engine Stalling Alert

I experienced similar issues with my 2019 Audi Q7 Hybrid last year. Having moderate experience with car maintenance, I initially thought the engine hesitation might be related to fuel quality, but the symptoms you describe match my situation exactly. The workshop diagnosed a faulty connection in the ignition system. The symptoms pointed to coil pack issues, but it turned out the connection between the coil and the wiring harness was compromised. After a thorough diagnostic check, they found corroded plug connections affecting the ignition system performance. The repair was relatively straightforward, they cleaned and replaced the affected connections, costing 95 Euro in total. The work took about 2 hours, and the engine hesitation issues disappeared completely. Could you share some additional details about your Q5: Current mileage, When did the symptoms first appear, Does the engine hesitation occur more frequently when the engine is cold or warm, Have you noticed any specific driving conditions that make it worse This information would help determine if your issue is similar to what I experienced or if it might be related to other components in the ignition system.

Thanks for your response. My Q5 was last serviced at 115000 KM during the regular maintenance interval. The check engine light first appeared about two weeks ago, and since then the engine stalling has become more frequent. The engine hesitation occurs mainly when the engine is cold, especially during the first 10 minutes of driving. The ignition coil issue seems most pronounced during morning starts. After the engine warms up, the performance improves slightly, but the rough running is still noticeable. I checked with my service records and noticed the spark plugs havent been replaced since 90000 KM. Given this and the coil failure symptoms you mentioned, Im thinking I should get both the ignition coils and spark plugs checked during the diagnostic.

Thanks for those details. After fixing my Q7s ignition system issues, I learned the cold-start symptoms you describe are quite telling. Your situation sounds even more similar to mine now, especially with the engine stalling being worse during cold starts. Given your spark plug service history, theres a high chance your rough running issues are caused by both worn spark plugs and potentially failing ignition coils. When my car was repaired, the technician explained that old spark plugs can put extra stress on the ignition coils, leading to premature coil failure. My final repair actually included: New spark plugs (due at 105000 KM anyway), Replacement of 2 ignition coils showing weak output, Cleaning of all coil connections Total cost came to 380 Euro and completely resolved the engine hesitation and cold-start issues. The check engine light hasnt returned since. Based on your mileage and symptoms, I would definitely recommend having both components checked. The diagnostic testing can pinpoint exactly which coils are failing, as they dont usually all fail at once.

Thanks everyone for the helpful responses. After considering all the feedback, I scheduled an appointment with my local workshop for next week. Given my mileage and the cold-start issues with engine hesitation, I agree its time to address both the spark plugs and possible coil failure. The detailed information about diagnostic steps and repair costs has been really useful. Its reassuring to know that others have resolved similar ignition system problems successfully. The fact that my check engine light symptoms and rough running match what others experienced with coil issues gives me confidence about the likely diagnosis. Ill make sure to ask the technician to check all ignition coils and spark plug connections during the diagnostic. Based on the repair costs shared, Ive budgeted around 400 Euro for the potential work. Will update the forum once I get the final diagnosis and repair completed.