Faulty Brake Light Switch Plagues Audi A3 TFSI Owners

I faced a similar issue with my 2010 Audi A4 2.0 TFSI. Having some experience working on cars, I initially thought it was a major brake system problem, but it turned out much simpler. The brake switch was actually working fine, the error messages appeared because the brake pedal wasnt properly returning to its rest position. There was some debris under the brake pedal preventing full release. After thoroughly cleaning the area around the automotive switch and brake pedal, the error messages disappeared completely. This is a common issue that often gets misdiagnosed as a faulty brake switch. Before replacing any parts, check if your brake pedal returns fully when released. The fix cost nothing, just required careful cleaning around the pedal assembly. For a more accurate diagnosis, could you share: Does the brake pedal feel different than usual? Are the brake lights working intermittently or not at all? Does the error appear while driving or only when starting the car? Have you noticed any changes in brake pedal height? This will help determine if your issue matches what I experienced or if its something else in the brake system that needs attention.

Last service was at 54500km and currently showing 56898km on the odometer. The electrical issue persists even after thoroughly checking the area around the brake pedal and cleaning it as suggested. The brake lights work intermittently, sometimes they stay on even when the pedal is not pressed. The error message appears out of nowhere while driving. After checking the wiring connections, I am quite certain its a faulty brake switch causing these symptoms. The brake pedal feels normal and returns properly to its position. Would appreciate advice on switch replacement procedures or expected repair costs before heading to a workshop. The intermittent brake light behavior really concerns me since its a safety issue. Has anyone successfully replaced the brake switch themselves or is this strictly a workshop job?

Thanks for the additional details. Based on the symptoms you described, especially the brake lights staying on without pedal pressure, this definitely points to a faulty brake switch rather than the debris issue I initially encountered. After dealing with my similar symptoms, I ended up replacing the brake switch. The part itself was around 50 Euro. If you have basic automotive repair skills, its actually a straightforward DIY job taking about 30-45 minutes. The brake switch usually clips in and out without needing special tools. Key steps I followed: 1. Disconnect battery 2. Remove lower dash panel under steering wheel 3. Locate brake switch above pedal 4. Unplug electrical connector 5. Release retaining clip 6. Install new switch, making sure it clicks firmly in place The tricky part is adjusting the new switch position correctly relative to the brake pedal. An incorrectly positioned switch can trigger tail light issues or brake system errors. If doing it yourself feels uncomfortable, most workshops charge about 1 hour labor (75-100 Euro) plus parts. Much cheaper than initially suspecting a major brake system problem. Just ensure you get the correct brake switch for your specific model year. The wrong switch can cause persistent error messages even after installation.

Thank you for the help and detailed DIY instructions. After considering the safety implications and time investment, I decided to tackle the brake switch replacement myself this weekend. Ordered the correct part for 45 Euro from a reputable supplier and it should arrive tomorrow. The intermittent tail light behavior was really making me nervous about vehicle safety, so fixing this has become a priority. Your step-by-step guide gives me confidence to attempt the repair, especially knowing its a common issue with a straightforward fix. The total cost will be significantly less than the 150 Euro quote I got from a local workshop. Once I complete the switch replacement, I will clear the error codes and verify all brake lights are functioning correctly. Really appreciate the advice about careful positioning of the new switch, will definitely take my time with that step to avoid any recurring issues. If I run into any complications during the installation, I might still need professional help, but at least now I understand exactly what needs to be done and can better discuss the repair with a mechanic if needed.