FixVault
Home
›
Mazda
›
1996
›
B3000 Base, Automatic
›
Repair and Diagnosis
›
Engine Performance
›
System
›
Engine Controls - Tests W/Codes
›
Diagnostic Trouble Code Charts
›
DTC P0420: Catalyst Efficiency Monitor Malfunction
DTC P0420: Catalyst Efficiency Monitor Malfunction
Fig 1: DTC P0420 Catalyst Efficiency Monitor Malfunction