RSQ3 Temp Sensor Glitch with Clogged Cooling Grille

A similar issue occurred with my RS3 2017. The symptoms match closely, erratic temperature readings and delayed warm-up times were early warning signs of multiple cooling system problems. The clogged radiator grille definitely impacts engine cooling. Restricted airflow through a dirty grille forces the cooling system to work harder, potentially leading to car overheating. However, the unusual temperature readings suggest a failing temperature sensor or wiring issue, rather than just an airflow problem. When this happened, the repair involved: Replacing faulty coolant temperature sensor, Cleaning the radiator grille and cooling passages, Checking and repairing damaged wiring to the sensor, Clearing the engine control module codes The temperature sensor failure was a serious issue that required immediate attention, as incorrect readings can prevent proper engine management and lead to automotive cooling problems. The check engine light in these cases often indicates the ECU detecting inconsistent temperature signals. Before visiting a shop, you can: 1. Clean the radiator grille thoroughly 2. Check coolant levels 3. Scan for specific error codes 4. Monitor if temperature readings stabilize after cleaning The entire cooling system should be inspected as sensor issues often coincide with other cooling component wear.

Thanks for your detailed response about the radiator blockage and sensor issues. My Audi got fixed last week and the temperature now reads correctly. Like you mentioned, it turned out to be both a clogged radiator grille and a faulty sensor. The engine cooling system works perfectly now. Just wondering, do you remember roughly how much the repair cost you? Also, have you noticed any other issues with the cooling system since getting it fixed? Asking because my mechanic mentioned something about possible radiator maintenance in the future.

Thanks for the update on your RSQ3. Glad to hear the cooling issues got resolved. When I had mine fixed, the total repair came to around 450 Euro, with 52 Euro for the fuse replacement. Like your case, clearing the cooling grille restriction made a huge difference in the engine cooling performance. Since the repair 18 months ago, my automotive cooling system has been working flawlessly. No more erratic temperature readings or engine overheating concerns. Regular radiator maintenance has helped prevent any new blockages from developing. Your mechanic is right about keeping an eye on the radiator. Preventative checks every 6 months can help catch potential cooling system issues early. This includes looking for debris buildup and ensuring proper coolant circulation. A properly functioning cooling system really transforms how the car runs. The engine temperature stays consistent now, and warm-up times are back to normal. The repair cost was worth avoiding more expensive damage down the line.

After reading lots of forum posts, I decided to take my car to a new mechanic. The diagnosis confirmed what many here suggested, a clogged cooling grille and faulty temperature sensor were causing the issues. The repair took about 4 hours and cost 580 Euro total, including parts and labor. The mechanic showed me how dirt and debris had built up in the radiator grille, restricting proper airflow to the engine cooling system. Once they cleaned everything and replaced the sensor, the temperature readings normalized immediately. The check engine light is now off and the car warms up normally. Definitely learned my lesson about regular cooling system maintenance. Going to make sure the radiator stays clean from now on to prevent engine overheating issues. Thanks again for the helpful advice that pointed me in the right direction for the fix.