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Home >> Mazda >> 2004 >> 3 i, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System] >> DTC P0421: Catalyst System Efficiency Below Threshold >> Diagnostic procedure

Diagnostic procedure

Fig 1: DTC P0421: Diagnostic Procedure Chart (Steps 1-8)
G00975266Courtesy of MAZDA MOTORS CORP.


Fig 1: DTC P0421: Diagnostic Procedure Chart (Steps 1-6)
G00975268Courtesy of MAZDA MOTORS CORP.
Fig 2: DTC P0421: Diagnostic Procedure Chart (Steps 7 & 8)
G00975269Courtesy of MAZDA MOTORS CORP.
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