VW Eos Trans Issues Linked to Failed Oil Sensor

I had a very similar issue with my VW Golf 2012 and can share my experience as someone with moderate car repair knowledge. The symptoms you describe match what I encountered, transmission warnings, rough shifting, and emergency mode. After checking the cooling system thoroughly, my workshop found that the pressure sensor cable connection was defective, causing false readings and making the transmission behave erratically. The coolant leak detection system and pressure gauge readings were showing incorrect values due to this faulty connection. Once the cable was properly reconnected and the sensor plug was cleaned, the transmission started working normally again. The cooling fan operation also returned to normal since the system was receiving accurate readings. The fix cost me 95€ which included diagnostic time and repair work. Much better than a full transmission repair. To provide more specific advice, could you share: Current mileage on your Eos, Whether you notice any coolant leaks, If the transmission fluid has been checked recently, What specific warning lights appear on the dashboard This information would help determine if your issue is identical to what I experienced or if additional checks might be needed.

Last service was completed at 123456km and diagnostics showed a P0748 code. Thanks for sharing your experience. The sensor cable connection issue sounds promising, especially since my symptoms match yours. No coolant leaks visible, but I have noticed the radiator coolant temperature fluctuates unusually. The transmission fluid was checked during the last service and appeared normal. The warning lights showing are transmission fault, check engine, and occasionally the oil pressure warning. My workshop also suggested inspecting the oil cooler for potential blockages that might affect transmission performance. The 95€ diagnostic fee seems reasonable compared to a complete transmission overhaul. Will have them check the sensor connections and cooling system components first before considering more extensive repairs.

Thanks for providing those details. After fixing my sensor connection issue, I also had the oil cooler inspected since the symptoms were so similar to yours. The pressure sensor readings remained inconsistent until we discovered partial blockage in the oil cooler. The radiator repair technician found that debris had accumulated, affecting both coolant circulation and pressure readings. A thorough flush of the cooling system and cleaning of the oil cooler resolved the remaining transmission issues. The total repair, including the earlier sensor work, came to 320€. The P0748 code you mentioned typically relates to pressure control solenoid issues, which can be triggered by incorrect sensor readings from a compromised cooling system. In my case, once the radiator coolant flow was restored and the pressure gauge showed correct values, the error codes cleared and never returned. Worth mentioning that the leak detection system also started working properly after the repair, confirming that the erratic temperature readings were connected to the restricted flow through the oil cooler rather than just a sensor issue. Definitely start with checking those connections and cooling system components. The symptoms and diagnostic code align perfectly with what I experienced.

I appreciate the detailed responses and shared experiences. The connection between cooling system issues and transmission behavior makes a lot of sense now. The fact that your repair costs totaled 320€ for both the sensor work and oil cooler service gives me a good benchmark for budgeting. My next step will be having the workshop investigate the sensor connections and car overheating symptoms, followed by a thorough inspection of the oil cooler for blockages. The fluctuating radiator coolant temperatures I noticed align with your experience of restricted flow problems. Your mention of clearing error codes after fixing the cooling system gives me hope this might be resolved without major transmission work. Will schedule the diagnostic work this week and have them focus on the cooling system components first, particularly checking for any coolant leaks or flow restrictions that could affect the pressure readings. Thanks for walking through your repair process. It helped confirm that starting with the simpler fixes around the cooling system makes more sense than jumping straight to transmission repairs.