November 2025 – ECUFILES Release
The classic Audi RS4 2.7 Bi-Turbo now has a clean catalyst-off solution for Bosch ME7.1 ECU from ECUFILES.
Many cat-off files for this engine disable far more than necessary. They turn off the first lambda sensor and other unrelated diagnostics, leaving the car with errors and reduced functionality.
Our file is different. We only disable what truly needs to be disabled for catalyst removal. The first lambda sensor stays 100% functional, all diagnostics remain active, and no unnecessary systems are touched.
This keeps the RS4 fully diagnosable and free of warning lights.
Benefits at a glance:
- Clean catalyst removal without errors
- First lambda and all diagnostics stay active
- No warning lights
- Readiness_ok in many cases
- Safe and reliable for road and track
Perfect for owners who want a free-flowing exhaust without losing the car’s original functionality.
Already available in your ECUFILES account.
