Possible Causes
WARNING: This page is about a different car, the 2003 Mazda MPV and 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
- Exhaust system leaks.
- Front HO2S malfunction.
- Loose front or rear HO2S.
- Warm Up Three Way Catalytic (WU-TWC) converter deterioration or malfunction.