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Home >> Mazda >> 1997 >> 626 DX, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.0L - A/T >> Circuit Tests >> DTC P0420 - Catalyst System Efficiency Below Threshold >> Notes

DTC P0420 - Catalyst System Efficiency Below Threshold: Notes

NOTE: For wiring diagram, see WIRING DIAGRAMS - 2.0L article. Always perform applicable drive cycle test after repair is performed to verify if DTC is reset.
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