RSQ3 Transmission & Oil Pressure Sensor Issues Solved

I had a very similar issue with my 2019 RS3. As someone with some hands-on experience working on cars, I initially thought it was a major transmission problem, but it turned out to be much simpler. The symptoms matched exactly what you described, erratic transmission behavior and warning lights. After taking it to my workshop, they found that the radiator coolant pressure sensor had a faulty cable connection. The cooling fan wasnt getting the right signals, which caused the transmission to go into protective mode. The repair was straightforward, they performed a leak detection test on the cooling system first to rule out any coolant leaks. Then used a pressure gauge to verify the sensor readings were incorrect. The final fix involved replacing the damaged wiring connector to the sensor, which cost 95 Euro including labor. Before suggesting more specific solutions, could you share: Current mileage on your RSQ3? When was the last coolant service performed? Are there any visible coolant leaks under the car? Does the issue happen more when the engine is hot or cold? These details would help determine if your case is similar to what I experienced with my RS3.

I had a very similar issue with my 2019 RS3. As someone with some hands-on experience working on cars, I initially thought it was a major transmission problem, but it turned out to be much simpler. The symptoms matched exactly what you described, erratic transmission behavior and warning lights. After taking it to my workshop, they found that the radiator coolant pressure sensor had a faulty cable connection. The cooling fan wasnt getting the right signals, which caused the transmission to go into protective mode. The repair was straightforward, they performed a leak detection test on the cooling system first to rule out any coolant leaks. Then used a pressure gauge to verify the sensor readings were incorrect. The final fix involved replacing the damaged wiring connector to the sensor, which cost 95 Euro including labor. Before suggesting more specific solutions, could you share: Current mileage on your RSQ3? When was the last coolant service performed? Are there any visible coolant leaks under the car? Does the issue happen more when the engine is hot or cold? These details would help determine if your case is similar to what I experienced with my RS3.

I had a very similar issue with my 2019 RS3. As someone with some hands-on experience working on cars, I initially thought it was a major transmission problem, but it turned out to be much simpler. The symptoms matched exactly what you described, erratic transmission behavior and warning lights. After taking it to my workshop, they found that the radiator coolant pressure sensor had a faulty cable connection. The cooling fan wasnt getting the right signals, which caused the transmission to go into protective mode. The repair was straightforward, they performed a leak detection test on the cooling system first to rule out any coolant leaks. Then used a pressure gauge to verify the sensor readings were incorrect. The final fix involved replacing the damaged wiring connector to the sensor, which cost 95 Euro including labor. Before suggesting more specific solutions, could you share: Current mileage on your RSQ3? When was the last coolant service performed? Are there any visible coolant leaks under the car? Does the issue happen more when the engine is hot or cold? These details would help determine if your case is similar to what I experienced with my RS3.

I had a very similar issue with my 2019 RS3. As someone with some hands-on experience working on cars, I initially thought it was a major transmission problem, but it turned out to be much simpler. The symptoms matched exactly what you described, erratic transmission behavior and warning lights. After taking it to my workshop, they found that the radiator coolant pressure sensor had a faulty cable connection. The cooling fan wasnt getting the right signals, which caused the transmission to go into protective mode. The repair was straightforward, they performed a leak detection test on the cooling system first to rule out any coolant leaks. Then used a pressure gauge to verify the sensor readings were incorrect. The final fix involved replacing the damaged wiring connector to the sensor, which cost 95 Euro including labor. Before suggesting more specific solutions, could you share: Current mileage on your RSQ3? When was the last coolant service performed? Are there any visible coolant leaks under the car? Does the issue happen more when the engine is hot or cold? These details would help determine if your case is similar to what I experienced with my RS3.

I had a very similar issue with my 2019 RS3. As someone with some hands-on experience working on cars, I initially thought it was a major transmission problem, but it turned out to be much simpler. The symptoms matched exactly what you described, erratic transmission behavior and warning lights. After taking it to my workshop, they found that the radiator coolant pressure sensor had a faulty cable connection. The cooling fan wasnt getting the right signals, which caused the transmission to go into protective mode. The repair was straightforward, they performed a leak detection test on the cooling system first to rule out any coolant leaks. Then used a pressure gauge to verify the sensor readings were incorrect. The final fix involved replacing the damaged wiring connector to the sensor, which cost 95 Euro including labor. Before suggesting more specific solutions, could you share: Current mileage on your RSQ3? When was the last coolant service performed? Are there any visible coolant leaks under the car? Does the issue happen more when the engine is hot or cold? These details would help determine if your case is similar to what I experienced with my RS3.

I had a very similar issue with my 2019 RS3. As someone with some hands-on experience working on cars, I initially thought it was a major transmission problem, but it turned out to be much simpler. The symptoms matched exactly what you described, erratic transmission behavior and warning lights. After taking it to my workshop, they found that the radiator coolant pressure sensor had a faulty cable connection. The cooling fan wasnt getting the right signals, which caused the transmission to go into protective mode. The repair was straightforward, they performed a leak detection test on the cooling system first to rule out any coolant leaks. Then used a pressure gauge to verify the sensor readings were incorrect. The final fix involved replacing the damaged wiring connector to the sensor, which cost 95 Euro including labor. Before suggesting more specific solutions, could you share: Current mileage on your RSQ3? When was the last coolant service performed? Are there any visible coolant leaks under the car? Does the issue happen more when the engine is hot or cold? These details would help determine if your case is similar to what I experienced with my RS3.

I had a very similar issue with my 2019 RS3. As someone with some hands-on experience working on cars, I initially thought it was a major transmission problem, but it turned out to be much simpler. The symptoms matched exactly what you described, erratic transmission behavior and warning lights. After taking it to my workshop, they found that the radiator coolant pressure sensor had a faulty cable connection. The cooling fan wasnt getting the right signals, which caused the transmission to go into protective mode. The repair was straightforward, they performed a leak detection test on the cooling system first to rule out any coolant leaks. Then used a pressure gauge to verify the sensor readings were incorrect. The final fix involved replacing the damaged wiring connector to the sensor, which cost 95 Euro including labor. Before suggesting more specific solutions, could you share: Current mileage on your RSQ3? When was the last coolant service performed? Are there any visible coolant leaks under the car? Does the issue happen more when the engine is hot or cold? These details would help determine if your case is similar to what I experienced with my RS3.

Thanks for the helpful input. Just to clarify, my RSQ3 has 90785 KM and had its last service 3 months ago. The pressure gauge readings from my workshop indicated inconsistent values, very similar to what you experienced. They also noticed slight issues with the oil cooler performance during testing. The transmission problems definitely get worse when the engine is fully warm, suggesting a direct link to the cooling system. No visible coolant leak underneath, but the technician mentioned potential internal seepage affecting the sensor readings. Will get the coolant pressure sensor and wiring checked as you suggested. The symptoms match up perfectly with what you described.

Thanks for the helpful input. Just to clarify, my RSQ3 has 90785 KM and had its last service 3 months ago. The pressure gauge readings from my workshop indicated inconsistent values, very similar to what you experienced. They also noticed slight issues with the oil cooler performance during testing. The transmission problems definitely get worse when the engine is fully warm, suggesting a direct link to the cooling system. No visible coolant leak underneath, but the technician mentioned potential internal seepage affecting the sensor readings. Will get the coolant pressure sensor and wiring checked as you suggested. The symptoms match up perfectly with what you described.

Thanks for the helpful input. Just to clarify, my RSQ3 has 90785 KM and had its last service 3 months ago. The pressure gauge readings from my workshop indicated inconsistent values, very similar to what you experienced. They also noticed slight issues with the oil cooler performance during testing. The transmission problems definitely get worse when the engine is fully warm, suggesting a direct link to the cooling system. No visible coolant leak underneath, but the technician mentioned potential internal seepage affecting the sensor readings. Will get the coolant pressure sensor and wiring checked as you suggested. The symptoms match up perfectly with what you described.

Thanks for the helpful input. Just to clarify, my RSQ3 has 90785 KM and had its last service 3 months ago. The pressure gauge readings from my workshop indicated inconsistent values, very similar to what you experienced. They also noticed slight issues with the oil cooler performance during testing. The transmission problems definitely get worse when the engine is fully warm, suggesting a direct link to the cooling system. No visible coolant leak underneath, but the technician mentioned potential internal seepage affecting the sensor readings. Will get the coolant pressure sensor and wiring checked as you suggested. The symptoms match up perfectly with what you described.

Thanks for the helpful input. Just to clarify, my RSQ3 has 90785 KM and had its last service 3 months ago. The pressure gauge readings from my workshop indicated inconsistent values, very similar to what you experienced. They also noticed slight issues with the oil cooler performance during testing. The transmission problems definitely get worse when the engine is fully warm, suggesting a direct link to the cooling system. No visible coolant leak underneath, but the technician mentioned potential internal seepage affecting the sensor readings. Will get the coolant pressure sensor and wiring checked as you suggested. The symptoms match up perfectly with what you described.

Thanks for the helpful input. Just to clarify, my RSQ3 has 90785 KM and had its last service 3 months ago. The pressure gauge readings from my workshop indicated inconsistent values, very similar to what you experienced. They also noticed slight issues with the oil cooler performance during testing. The transmission problems definitely get worse when the engine is fully warm, suggesting a direct link to the cooling system. No visible coolant leak underneath, but the technician mentioned potential internal seepage affecting the sensor readings. Will get the coolant pressure sensor and wiring checked as you suggested. The symptoms match up perfectly with what you described.

Thanks for the helpful input. Just to clarify, my RSQ3 has 90785 KM and had its last service 3 months ago. The pressure gauge readings from my workshop indicated inconsistent values, very similar to what you experienced. They also noticed slight issues with the oil cooler performance during testing. The transmission problems definitely get worse when the engine is fully warm, suggesting a direct link to the cooling system. No visible coolant leak underneath, but the technician mentioned potential internal seepage affecting the sensor readings. Will get the coolant pressure sensor and wiring checked as you suggested. The symptoms match up perfectly with what you described.

Thanks for those details, definitely confirms my initial suspicions about the pressure sensor being the culprit. After dealing with this on my RS3, I learned that these cars are particularly sensitive to cooling system pressure variations. When my car overheating issues started affecting transmission performance, replacing just the radiator pressure sensor didnt fully solve it. The workshop found that the oil cooler was also contributing to the problem, creating those inconsistent pressure readings you mentioned. The complete fix for my car involved: New pressure sensor and wiring harness, Oil cooler replacement, Full system pressure test, Cooling fan operation verification, Fresh coolant flush Total cost was around 750 Euro, but it completely resolved both the transmission and temperature issues. After 30000 KM, everything still works perfectly. Since your mileage is similar to what mine was and the symptoms are identical, I strongly recommend having them check the oil cooler along with the pressure sensor. The cooling system needs to be working at 100% to prevent the transmission from going into protective mode.

Thanks for those details, definitely confirms my initial suspicions about the pressure sensor being the culprit. After dealing with this on my RS3, I learned that these cars are particularly sensitive to cooling system pressure variations. When my car overheating issues started affecting transmission performance, replacing just the radiator pressure sensor didnt fully solve it. The workshop found that the oil cooler was also contributing to the problem, creating those inconsistent pressure readings you mentioned. The complete fix for my car involved: New pressure sensor and wiring harness, Oil cooler replacement, Full system pressure test, Cooling fan operation verification, Fresh coolant flush Total cost was around 750 Euro, but it completely resolved both the transmission and temperature issues. After 30000 KM, everything still works perfectly. Since your mileage is similar to what mine was and the symptoms are identical, I strongly recommend having them check the oil cooler along with the pressure sensor. The cooling system needs to be working at 100% to prevent the transmission from going into protective mode.

Thanks for those details, definitely confirms my initial suspicions about the pressure sensor being the culprit. After dealing with this on my RS3, I learned that these cars are particularly sensitive to cooling system pressure variations. When my car overheating issues started affecting transmission performance, replacing just the radiator pressure sensor didnt fully solve it. The workshop found that the oil cooler was also contributing to the problem, creating those inconsistent pressure readings you mentioned. The complete fix for my car involved: New pressure sensor and wiring harness, Oil cooler replacement, Full system pressure test, Cooling fan operation verification, Fresh coolant flush Total cost was around 750 Euro, but it completely resolved both the transmission and temperature issues. After 30000 KM, everything still works perfectly. Since your mileage is similar to what mine was and the symptoms are identical, I strongly recommend having them check the oil cooler along with the pressure sensor. The cooling system needs to be working at 100% to prevent the transmission from going into protective mode.

Thanks for those details, definitely confirms my initial suspicions about the pressure sensor being the culprit. After dealing with this on my RS3, I learned that these cars are particularly sensitive to cooling system pressure variations. When my car overheating issues started affecting transmission performance, replacing just the radiator pressure sensor didnt fully solve it. The workshop found that the oil cooler was also contributing to the problem, creating those inconsistent pressure readings you mentioned. The complete fix for my car involved: New pressure sensor and wiring harness, Oil cooler replacement, Full system pressure test, Cooling fan operation verification, Fresh coolant flush Total cost was around 750 Euro, but it completely resolved both the transmission and temperature issues. After 30000 KM, everything still works perfectly. Since your mileage is similar to what mine was and the symptoms are identical, I strongly recommend having them check the oil cooler along with the pressure sensor. The cooling system needs to be working at 100% to prevent the transmission from going into protective mode.

Thanks for those details, definitely confirms my initial suspicions about the pressure sensor being the culprit. After dealing with this on my RS3, I learned that these cars are particularly sensitive to cooling system pressure variations. When my car overheating issues started affecting transmission performance, replacing just the radiator pressure sensor didnt fully solve it. The workshop found that the oil cooler was also contributing to the problem, creating those inconsistent pressure readings you mentioned. The complete fix for my car involved: New pressure sensor and wiring harness, Oil cooler replacement, Full system pressure test, Cooling fan operation verification, Fresh coolant flush Total cost was around 750 Euro, but it completely resolved both the transmission and temperature issues. After 30000 KM, everything still works perfectly. Since your mileage is similar to what mine was and the symptoms are identical, I strongly recommend having them check the oil cooler along with the pressure sensor. The cooling system needs to be working at 100% to prevent the transmission from going into protective mode.

Thanks for those details, definitely confirms my initial suspicions about the pressure sensor being the culprit. After dealing with this on my RS3, I learned that these cars are particularly sensitive to cooling system pressure variations. When my car overheating issues started affecting transmission performance, replacing just the radiator pressure sensor didnt fully solve it. The workshop found that the oil cooler was also contributing to the problem, creating those inconsistent pressure readings you mentioned. The complete fix for my car involved: New pressure sensor and wiring harness, Oil cooler replacement, Full system pressure test, Cooling fan operation verification, Fresh coolant flush Total cost was around 750 Euro, but it completely resolved both the transmission and temperature issues. After 30000 KM, everything still works perfectly. Since your mileage is similar to what mine was and the symptoms are identical, I strongly recommend having them check the oil cooler along with the pressure sensor. The cooling system needs to be working at 100% to prevent the transmission from going into protective mode.

Thanks for those details, definitely confirms my initial suspicions about the pressure sensor being the culprit. After dealing with this on my RS3, I learned that these cars are particularly sensitive to cooling system pressure variations. When my car overheating issues started affecting transmission performance, replacing just the radiator pressure sensor didnt fully solve it. The workshop found that the oil cooler was also contributing to the problem, creating those inconsistent pressure readings you mentioned. The complete fix for my car involved: New pressure sensor and wiring harness, Oil cooler replacement, Full system pressure test, Cooling fan operation verification, Fresh coolant flush Total cost was around 750 Euro, but it completely resolved both the transmission and temperature issues. After 30000 KM, everything still works perfectly. Since your mileage is similar to what mine was and the symptoms are identical, I strongly recommend having them check the oil cooler along with the pressure sensor. The cooling system needs to be working at 100% to prevent the transmission from going into protective mode.

Thank you for the detailed response. After getting the initial feedback about the radiator oil pressure problems, having those additional details about your similar case is really helpful. Based on my mileage and symptoms matching your experience, I will definitely have them perform a complete cooling system inspection. Makes perfect sense that the car overheating protection would trigger transmission issues through the safety systems. I called the workshop back and scheduled a complete diagnostic focusing on: Pressure sensor and wiring check, Oil cooler inspection, Full cooling system pressure testing, Radiator repair if needed The fact that my transmission issues get worse with heat and the cooling fan behavior matches your case exactly. At around 750 Euro for a complete fix, that seems reasonable compared to what a transmission rebuild would cost. Will update once they complete the work, but I feel much more confident now having a clear direction for the repairs. This sounds like exactly what I need to resolve both the transmission and temperature-related warning lights.

Thank you for the detailed response. After getting the initial feedback about the radiator oil pressure problems, having those additional details about your similar case is really helpful. Based on my mileage and symptoms matching your experience, I will definitely have them perform a complete cooling system inspection. Makes perfect sense that the car overheating protection would trigger transmission issues through the safety systems. I called the workshop back and scheduled a complete diagnostic focusing on: Pressure sensor and wiring check, Oil cooler inspection, Full cooling system pressure testing, Radiator repair if needed The fact that my transmission issues get worse with heat and the cooling fan behavior matches your case exactly. At around 750 Euro for a complete fix, that seems reasonable compared to what a transmission rebuild would cost. Will update once they complete the work, but I feel much more confident now having a clear direction for the repairs. This sounds like exactly what I need to resolve both the transmission and temperature-related warning lights.

Thank you for the detailed response. After getting the initial feedback about the radiator oil pressure problems, having those additional details about your similar case is really helpful. Based on my mileage and symptoms matching your experience, I will definitely have them perform a complete cooling system inspection. Makes perfect sense that the car overheating protection would trigger transmission issues through the safety systems. I called the workshop back and scheduled a complete diagnostic focusing on: Pressure sensor and wiring check, Oil cooler inspection, Full cooling system pressure testing, Radiator repair if needed The fact that my transmission issues get worse with heat and the cooling fan behavior matches your case exactly. At around 750 Euro for a complete fix, that seems reasonable compared to what a transmission rebuild would cost. Will update once they complete the work, but I feel much more confident now having a clear direction for the repairs. This sounds like exactly what I need to resolve both the transmission and temperature-related warning lights.

Thank you for the detailed response. After getting the initial feedback about the radiator oil pressure problems, having those additional details about your similar case is really helpful. Based on my mileage and symptoms matching your experience, I will definitely have them perform a complete cooling system inspection. Makes perfect sense that the car overheating protection would trigger transmission issues through the safety systems. I called the workshop back and scheduled a complete diagnostic focusing on: Pressure sensor and wiring check, Oil cooler inspection, Full cooling system pressure testing, Radiator repair if needed The fact that my transmission issues get worse with heat and the cooling fan behavior matches your case exactly. At around 750 Euro for a complete fix, that seems reasonable compared to what a transmission rebuild would cost. Will update once they complete the work, but I feel much more confident now having a clear direction for the repairs. This sounds like exactly what I need to resolve both the transmission and temperature-related warning lights.

Thank you for the detailed response. After getting the initial feedback about the radiator oil pressure problems, having those additional details about your similar case is really helpful. Based on my mileage and symptoms matching your experience, I will definitely have them perform a complete cooling system inspection. Makes perfect sense that the car overheating protection would trigger transmission issues through the safety systems. I called the workshop back and scheduled a complete diagnostic focusing on: Pressure sensor and wiring check, Oil cooler inspection, Full cooling system pressure testing, Radiator repair if needed The fact that my transmission issues get worse with heat and the cooling fan behavior matches your case exactly. At around 750 Euro for a complete fix, that seems reasonable compared to what a transmission rebuild would cost. Will update once they complete the work, but I feel much more confident now having a clear direction for the repairs. This sounds like exactly what I need to resolve both the transmission and temperature-related warning lights.

Thank you for the detailed response. After getting the initial feedback about the radiator oil pressure problems, having those additional details about your similar case is really helpful. Based on my mileage and symptoms matching your experience, I will definitely have them perform a complete cooling system inspection. Makes perfect sense that the car overheating protection would trigger transmission issues through the safety systems. I called the workshop back and scheduled a complete diagnostic focusing on: Pressure sensor and wiring check, Oil cooler inspection, Full cooling system pressure testing, Radiator repair if needed The fact that my transmission issues get worse with heat and the cooling fan behavior matches your case exactly. At around 750 Euro for a complete fix, that seems reasonable compared to what a transmission rebuild would cost. Will update once they complete the work, but I feel much more confident now having a clear direction for the repairs. This sounds like exactly what I need to resolve both the transmission and temperature-related warning lights.

Thank you for the detailed response. After getting the initial feedback about the radiator oil pressure problems, having those additional details about your similar case is really helpful. Based on my mileage and symptoms matching your experience, I will definitely have them perform a complete cooling system inspection. Makes perfect sense that the car overheating protection would trigger transmission issues through the safety systems. I called the workshop back and scheduled a complete diagnostic focusing on: Pressure sensor and wiring check, Oil cooler inspection, Full cooling system pressure testing, Radiator repair if needed The fact that my transmission issues get worse with heat and the cooling fan behavior matches your case exactly. At around 750 Euro for a complete fix, that seems reasonable compared to what a transmission rebuild would cost. Will update once they complete the work, but I feel much more confident now having a clear direction for the repairs. This sounds like exactly what I need to resolve both the transmission and temperature-related warning lights.