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Home >> Mazda >> 2004 >> MPV ES >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System AJ] >> DTC P0421, P0431:Warm-Up Catalyst System (RH) Efficiency Below Threshold; Warm-Up Catalyst System (LH) Efficiency Below Threshold >> Diagnostic Procedure

Diagnostic Procedure

Fig 1: DTC P0421, P0431 Diagnostic Procedure Chart (Step 1-6)
G00998080Courtesy of MAZDA MOTORS CORP.
Fig 2: DTC P0421, P0431 Diagnostic Procedure Chart (Step 7-8)
G00998081Courtesy of MAZDA MOTORS CORP.
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