Q3 Washer System Failure Despite Full Fluid Tank

As a Q5 owner (2020 model, 2.0 TFSI), I encountered this exact windshield cleaning system failure last winter. The washer fluid warning light stayed on despite a full tank, followed by complete wiper system failure. The root cause was a faulty washer fluid level sensor combined with a wiring harness issue near the pump. These components can corrode over time, sending incorrect signals to the control module. In my case, the system required: Replacement of the washer fluid level sensor, Repair of the wiring harness, Recalibration of the wiper control module This turned out to be a moderate repair, not particularly complex but requiring specific diagnostic equipment to reset the system properly. The job took about 2 hours at the workshop. Worth noting: If you keep driving with this issue, you risk damaging the wiper motor itself, which would make the repair significantly more extensive. The warning light should be addressed promptly, even if the tank appears full. Modern wiper systems are more complex than older models, with multiple sensors and electronic components working together.

Thanks for sharing that experience with your Q5. I have a similar issue with my Q3 right now, the washer motor seems dead and the spray jets are not working at all, even though the tank is completely full. Really helpful to know about the sensor and wiring being potential culprits. Could you share what the final repair cost was in your case? Also wondering if youve had any repeat issues since getting it fixed? The warning light keeps coming back on my dashboard and Im trying to gauge if this might become a recurring problem.

Had my Q5 repaired last week for the exact same problem. Total repair was 25 Euro, which covered diagnosing and fixing the wiper fluid level sensor. Since the repair, the warning light has stayed off and the windshield washer system works perfectly. The mechanic confirmed the fluid level was too low despite the tank appearing full. Once they topped up the washer fluid and recalibrated the sensor, everything returned to normal. No recurring issues with the warning light or wiper system since then. If your warning light keeps returning despite having proper fluid levels, you might need the sensor replaced completely rather than just recalibrated. Best to have it checked soon to avoid potential damage to other wiper system components.

Just got back from the mechanic regarding my Q3 washer system problem. The total repair came to 280 Euro, quite a bit more than expected. Turns out the wiring harness was severely corroded and the washer fluid pump needed replacement. The warning light issue was indeed caused by a faulty sensor sending wrong signals. They had to replace both the pump and sensor unit, plus fix some damaged wiring. The mechanic showed me the old parts, pretty clear why the system was acting up. After the repair, the windshield cleaning system works perfectly. No more warning lights on the dashboard. While the cost was higher than hoped, at least the wiper system is fully functional again. Much better than risking further damage by waiting. Good to have this resolved before winter hits. Would definitely recommend getting these warning lights checked early rather than letting them persist like I did. The repair took about 3 hours total, but worth it for peace of mind.