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Home >> Mazda >> 2000 >> 626 ES, 2.0 C, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0420 Or P0421: Catalyst Efficiency Monitor & Exhaust Systems >> Notes

DTC P0420 Or P0421: Catalyst Efficiency Monitor & Exhaust Systems: Notes

NOTE: DTC P0420 applies to Federal emissions vehicles. DTC P0421 applies to California emissions vehicles.

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