S7 Multiple Sensor Failures Linked to Humidity Issues

Having faced similar issues with my 2019 S5, these symptoms strongly indicate a central electrical issue rather than individual component failures. The climate control malfunction affecting multiple systems typically points to a faulty body control module or damaged wiring harness. When my car displayed comparable windshield fogging and climate system problems, the root cause was corroded connector pins in the main wiring harness. The humidity sensor malfunction triggered dashboard warnings but was not the primary issue. The electrical system controls both the AC and heating elements for mirrors and washer nozzles through this central connection point. The repair required: Complete diagnostic scan, Removal of dashboard components, Replacement of corroded wiring connectors, Recalibration of climate control system This was a serious repair requiring specialized diagnostic equipment and several hours of labor. These interconnected electrical issues affect safety systems and should not be ignored, especially given your high mileage. A proper fix needs complete electrical diagnosis rather than replacing individual sensors, as the previous mechanic may have suggested. The fact that multiple systems are affected supports this assessment.

Thanks for the detailed explanation about the wiring harness issue. I actually have a nearly identical problem with my 2021 Audi S7, where the climate control and sensor systems are acting up. Got it diagnosed last week and the mechanic mentioned similar findings about corroded connectors. Question, do you remember roughly what the total repair cost was? Just trying to budget for the fix since my car visibility is getting worse with the foggy windshield issue. Also, has everything worked perfectly since the repair or have you noticed any lingering dashboard warning lights or sensor problems?

Glad to provide an update on my S5 repair. Getting the car sensor issue fixed was straightforward once the right diagnosis was made. The total cost came to 95 Euro for repairing a faulty cable connection linked to the humidity sensor malfunction. Since the repair, the climate control system works flawlessly. No more windshield fogging issues or warning lights on the dashboard. The mirror heaters and washer nozzles are functioning normally again too. The mechanic found that the connector plug was causing intermittent electrical problems, which explained why multiple systems were affected. Much simpler and cheaper fix than initially expected, no need for extensive dashboard removal or complete wiring harness replacement. If your symptoms match mine, you might be looking at a similar straightforward repair rather than a major electrical overhaul. All car sensors are now working as intended without any error codes or system malfunctions. Based on my experience, once the connection issue is properly addressed, these problems typically dont return.

After getting different opinions, I took my S7 to a specialized shop last week. The mechanic found corroded connectors affecting multiple automotive sensors, just as suggested. The repair took about 4 hours and cost 680 Euro, including the sensor calibration and new wiring components. The dashboard warning lights disappeared immediately after the fix. My AC is working perfectly now, and the mirror heaters kicked right back into action. Most importantly, the constant windshield fogging issue is completely gone. The washer nozzles also work great even in cold conditions. The technician showed me the damaged connectors and explained how a small electrical issue can cascade into multiple system failures. Really glad I got a proper diagnosis instead of continuing to replace individual parts. No lingering problems since the repair, everything works like new again. Really appreciate the help in identifying the root cause. Would have spent way more time and money chasing individual sensor problems without this guidance.