RS3 Engine Control Unit Failure Symptoms & Fix Help

Experienced a similar ECU problem with my Audi RS4 2019. The symptoms matched exactly, reduced engine performance and error codes in the computer module. The main relay was failing intermittently, causing the engine control system to malfunction. The repair required specialized diagnostic equipment to properly identify the faulty components in the ECU. This was a serious issue that needed immediate attention, as continued driving could have led to complete engine control failure. The fix involved replacing the main relay and reprogramming the control module. Due to the complexity of modern engine control systems, the work had to be done at a shop with certified Audi ECU repair capabilities. The entire process took about 6 hours. Key indicators of main relay failure include: Unusual engine performance drops, Check engine light staying on, Computer module throwing multiple error codes, Engine occasionally failing to start Important note: These symptoms can also indicate other ECU problems, so proper diagnostics are essential before replacing parts. Given the complexity of modern vehicle electronics, DIY repairs are not recommended for this type of issue.

Yes, that was exactly my issue with the main relay affecting the engine control unit! Really glad to hear someone else went through this. Since getting it fixed last month, the performance has been back to normal and no more error codes showing up. Would you mind sharing how much the repair cost you? In my case, looking for a qualified shop that could handle ECU problems was crucial. Just wondering if any other electrical gremlins popped up since your repair was completed? With all the complex vehicle electronics these days, I am always a bit worried about related issues surfacing later.

After getting the main relay fixed by a certified shop specializing in vehicle electronics, my RS4 has been running perfectly for over a year now. The repair cost was 120 Euro for the main relay replacement, which was actually quite reasonable considering the complexity of engine control systems in modern Audis. The car diagnostics have shown no additional error codes since the repair. The ECU repair shop did a thorough check of all related electronic components while they had the car, which gave me confidence in the fix. The engine performance returned to normal immediately after the repair. Important for others facing similar issues, having a shop with proper diagnostic equipment and ECU repair expertise is crucial. While the main relay might seem like a simple component, its role in the engine control system means repairs need to be done precisely to prevent future issues. The investment in proper repairs definitely paid off, as I have had zero electronic-related problems since then. The engine control system has been working flawlessly, and the car performs exactly as it should.

Thanks for sharing your experience. I finally got my RS3 fixed last week after finding a shop specializing in automotive electronics. The total repair came to 145 Euro including parts and labor. The technician spent about 4 hours running system checks and replacing the faulty relay. What really impressed me was how thorough they were with the computer module testing. They even performed a complete system reset after the repair to ensure all control systems were properly calibrated. The engine performance improved instantly after the fix. The mechanic explained that modern engine control units are quite sensitive, and getting expert help was definitely the right call. They also checked surrounding components to prevent any related issues. After a week of driving, everything is running perfectly, no error codes, no performance drops, just smooth operation like before. Feels good to have this sorted by professionals who really knew their way around vehicle electronics. Hopefully this helps others facing similar issues with their cars.