DTC P0421 Or DTC P0431: Notes
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.
Code Definition
- DTC P0421: Warm Up Catalyst System Efficiency Below Threshold - Right Side
- DTC P0431: Catalyst System Efficiency Below Threshold - Left Side