Multiple Audi Q2 Electrical Systems Fail Simultaneously

I had nearly identical issues on my 2020 Audi Q3, so I can share some relevant experience as someone with moderate car repair knowledge. The multiple system failures pointed to a malfunctioning connection rather than individual component issues. After running diagnostics, my workshop found a faulty wiring harness connector near the humidity sensor, which was causing visibility system malfunctions and affecting multiple car sensors. The repair involved cleaning and reseating the connector, plus replacing one damaged wire. Total cost was 95 Euro, which covered both diagnosis and repair. The dashboard warning cleared immediately after the fix, and all affected systems started working normally again. This type of issue often stems from moisture damage or vibration loosening connections over time. The car sensor problems you describe match my experience exactly, especially the climate control and washer system failures occurring together. To better assist, could you share: Have you noticed any correlation with wet weather? Did these issues start gradually or all at once? Are there any other warning lights active besides the stored error? Have you had any recent work done near the windshield area? This information would help determine if your Q2 is experiencing the same connector issue I encountered.

Thanks for sharing this detailed response. My vehicle has 127844 KM and the last service was done 2 months ago. After reading your feedback, I checked and noticed these electrical issues started appearing right after we had several rainy days. The malfunction definitely happened all at once, I started the car one morning and got multiple dashboard warnings simultaneously. The climate control system is completely unresponsive, and theres only one stored error showing on the dash. No other warning lights are active. We havent had any recent windshield work done, but I noticed some slight condensation inside the front windscreen area last week. Based on your similar experience, it does sound like it could be a wiring harness issue affecting the humidity sensor connections. Planning to have it checked at a workshop this week.

Thanks for those additional details about your Q2. This information reinforces my initial thoughts about the wiring harness connector being the culprit, especially given the timing with the rainy weather and the windshield fogging you noticed. The condensation you mentioned is particularly telling. In my case, the moisture had slowly worked its way into the connector housing, leading to intermittent sensor calibration issues before the complete system failure. The internal corrosion affected multiple car sensor readings simultaneously. Since your mileage is higher than when I experienced the issue, its worth having the workshop check the entire humidity sensor assembly along with the wiring. In my follow-up maintenance, I learned that applying dielectric grease to the cleaned connections helps prevent future moisture-related malfunctions. The workshop should focus on three key areas: 1. The wiring harness connector near the rain sensor 2. The ground connection points 3. The humidity sensor mounting seal The complete dashboard warning resolution might require a system reset after the physical repair, which the workshop can handle during the same visit. Let us know what the workshop discovers. This type of electrical issue can be tricky to diagnose without proper tools, but the symptoms match the wiring harness problem exactly.

I really appreciate the thorough explanation and troubleshooting suggestions. The connection between the condensation and potential wiring harness issues makes perfect sense, especially considering how the humidity sensor malfunction lines up with the rainy weather we had. The fact that your repair was straightforward and relatively inexpensive at 95 Euro gives me hope this wont be a major problem. Ive scheduled an appointment with my workshop for tomorrow morning, and Ill make sure to have them check all three areas you mentioned, the wiring harness, ground connections, and sensor mounting seal. My electrical issues match yours almost exactly, from the climate control failure to the dashboard warning and washer system problems. The workshop can hopefully address the sensor calibration requirements and complete system reset needed to resolve these malfunctions. Ill post an update once I get the diagnosis and repair completed. Thanks again for sharing your experience, it helped narrow down the likely cause and saved me some diagnostic time at the workshop.