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Home >> Toyota >> 1998 >> Tercel Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System Tests W/Codes >> Self-Diagnostic Tests >> DTC P0420: Catalyst System Efficiency Below Threshold >> Notes
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DTC P0420: Catalyst System Efficiency Below Threshold: Notes

NOTE: Oxygen sensor No. 1 refers to sensor located in exhaust manifold. Oxygen sensor No. 2 refers to sensor located behind catalytic converter.
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