Audi A8 Hybrid Ignition Coil Failure Alert & Solutions

As someone with some hands-on experience with hybrid vehicles, I faced almost identical symptoms with my 2018 Audi A6 Hybrid. The misfire and engine hesitation issues you describe match my experience perfectly. After experiencing similar coil pack problems and engine stalling, my initial thought was the ignition coils needed replacement. However, the workshop discovered the root cause was actually much simpler, a loose connection in the wiring harness leading to the coil pack assembly. The cable connection had worked itself loose over time, causing intermittent coil failure symptoms. The fix was straightforward and cost 95 Euro for diagnostic time and repairs to secure the connection properly. Since then, the engine has run smoothly with no more misfires or hesitation. To provide more specific advice for your situation, could you share: Current mileage on your A8, Whether the check engine light shows steady or flashing, If the symptoms occur more frequently when the engine is cold or warm, Any diagnostic codes retrieved from the vehicle Understanding these details would help determine if your issue stems from the same root cause or requires different attention.

Thanks for sharing your experience. My A8 just had its service at 188849KM last month. The check engine light stays steady, not flashing, and the engine hesitation occurs mostly when the engine is warm, particularly in stop-and-go traffic. The diagnostic scanner showed error code P0301, pointing to cylinder 1 misfire. After reading about your similar experience with the wiring harness, I will have the workshop check the connections to the coil pack assembly first before replacing parts. The ignition system symptoms you described match mine exactly, especially the rough running and stalling behavior. Id appreciate if others could share if checking the wiring connections resolved their coil pack issues without needing full replacement.

I can definitely follow up on my previous response since I dealt with a very similar situation. After seeing your details about the P0301 code and symptoms during warm operation, this actually mirrors my A6s behavior even more closely than I initially thought. The steady check engine light and specific cylinder 1 misfire strongly suggest an ignition system issue. In my case, the wiring connection fix solved the initial problems, but they returned after about 2 months. The complete diagnosis revealed that while the loose connection was part of the problem, one ignition coil had actually failed due to the intermittent power supply. I ended up replacing the problematic ignition coil and securing all wiring connections properly. Total cost came to 285 Euro including parts and labor. The engine stalling and rough running issues disappeared completely after this combined fix. Given your mileage and the specific error code, I recommend having both the wiring and the coil itself inspected. Ignition coil failure often shows these exact symptoms, misfire under load, rough idle, and hesitation during acceleration. The fact that your issues worsen with a warm engine also matches the typical pattern of a failing coil.

Thanks everyone for the detailed responses. After taking my A8 to the workshop, they found both issues, a loose wiring connection and a failing ignition coil on cylinder 1. The complete repair including parts and labor cost 320 Euro, slightly more than expected but worth every cent. The vehicle diagnostics confirmed what you all suggested, the combination of wiring issues and coil failure was causing the misfire and engine hesitation. They replaced the faulty ignition coil, secured all wiring connections, and performed a complete spark plug inspection while they were at it. Its been two weeks now, and the engine runs perfectly with no stalling or rough running. The check engine light has stayed off, and the jerky acceleration is completely gone. Really appreciate the advice about checking both the wiring and coil pack, it saved me from potentially replacing parts unnecessarily or missing the full scope of the problem. For anyone searching the forum later with similar issues, definitely have both the wiring connections and ignition coils checked if experiencing these symptoms.