Diagnostic Aids

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

During diagnosis, park the vehicle on a level surface.
Check the vehicle for proper alignment. The car should not pull in either direction while driving straight on a level surface.
Find out from the customer the conditions under which the DTC was set. This information will help to duplicate the failure.
The Snapshot function on the scan tool can help find an intermittent DTC.