Possible Causes
WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
Possible causes are:
- Battery or PCM has been disconnected.
- OBD-II monitor failure had occurred before completion of an OBD-II drive cycle.
- PCM DTCs have been cleared with a scan tool as part of a service process.
- Vehicle is new from factory and has not completed an OBD-II drive cycle.