Audi S7 Multiple Electrical Faults Need Urgent Fix

Had a similar situation with my 2018 Audi S6. Initially thought it was just a turn signal issue, but the electrical faults turned out to be related to a faulty connection. Having some experience with automotive electrical systems helped identify the general area of concern. The main problem was traced to corroded plug connections affecting the turn signal circuit and causing interference with other electrical systems. The workshop conducted a full diagnostic scan which revealed multiple electrical fault codes related to the signal lamp assembly. The fix involved cleaning and reseating the connector pins, plus replacing one damaged wire harness connector. Total repair cost was 95 Euro, mostly labor since the actual parts were minimal. After the repair, both the electrical faults and flasher relay issues were completely resolved. Before suggesting specific solutions for your S7, could you provide: Are you getting any specific error codes? Does the turn signal work intermittently or not at all? When did these issues first appear, gradually or suddenly? Have you noticed any moisture inside the signal lamp housing? This information would help determine if your issue matches what I experienced or might be something different.

Just had my last service done at 99483 KM and noticed similar electrical fault issues appearing shortly after. The diagnostic scan revealed code B1304 related to signal lamp malfunction. The turn indicator stopped working completely after a week of intermittent operation. No moisture visible in the housing, but the lens does show some minor cracks that could have led to internal damage. Getting new error codes almost daily now, which makes me think its more than just a simple lamp replacement needed.

Thanks for providing those details. My S6 actually showed similar behavior after hitting the 95000 KM mark, and the B1304 code was exactly what I encountered too. The increasing frequency of new error codes matches my experience, it started with the turn signal lamp fault but quickly cascaded into multiple electrical warnings. Those small cracks you mentioned in the lens are concerning, as they often lead to connection issues beyond just the bulb replacement. In my case, the workshop found that while the turn indicator itself was malfunctioning, the real culprit was the degraded wiring connection where moisture had slowly worked its way through those tiny cracks. The signal lamp assembly was compromised, allowing minimal but damaging moisture ingress over time. The complete fix required: New turn signal assembly (320 Euro), Replacement of corroded connector pins (85 Euro), Resealing of the entire housing unit (120 Euro) This resolved all error codes, including those seemingly unrelated electrical faults. The repair costs were higher than a simple bulb replacement, but it prevented potential damage to other electrical components. Based on the similarities, I would strongly recommend having the entire signal lamp assembly checked, not just the visible components. The timing and progression of your issues are nearly identical to what I experienced.

I appreciate the detailed comparison with your S6 experience. Those repair costs actually align with what I was quoted initially, though I was hoping for a simpler fix. The progression of problems matching so closely to your situation gives me a clearer picture of what to expect. Your mention of the flasher relay and indicator light issues developing after similar mileage is particularly relevant. Since posting my question, two more error codes appeared on the dashboard, which seems to confirm your point about the cascading electrical faults. I will have the workshop do a complete check of the signal lamp assembly and surrounding connections rather than just replacing the broken lens. Better to address all potential issues now than risk further electrical problems. The automotive lighting system being so interconnected in these models makes sense why a single point of failure can trigger multiple faults. Thanks for breaking down the specific repair steps and costs. Will book the car in next week and request they check for moisture damage around the turn signal housing connections as you suggested.