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Home › Mazda › 2004 › MX-5 Miata Base, Automatic › Repair and Diagnosis › Engine Performance › System › On-Board Diagnostic (Engine Control System BP, BP With TC] › DTC P0420: Catalyst System Efficiency Below Threshold › Notes

DTC P0420: Catalyst System Efficiency Below Threshold: Notes

Fig 1: Possible Causes - DTC P0420 [BP, BP With TC]
G00992752Courtesy of MAZDA MOTORS CORP.
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