Air Leak Checks
- Ensure exhaust system has no leaks. Connect CO tester using Adapter (VAG 1363/3) on CO tap tube. Start engine and allow it to idle at closed throttle position.
- Spray air intake system with Leak Detector Spray (G 001 800 A1). Air intake leaks will draw in leak detector spray. The spray reduces air/fuel mixture ignition and engine RPM, and decreases CO reading. Repair leaks as necessary.