Reading and erasing diagnostic trouble codes (DTCs)
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Read off and erase diagnostic trouble codes (DTCs).
Screw the engine control module (ECM) into place.
Tighten the security screw.
Reinstall the side panels on the left and right-hand sides.
Test the function.