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Home >> Toyota >> 1997 >> 4Runner Base, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.7L >> Circuit Tests >> DTC P0420: Catalyst System Efficiency Below Threshold >> Notes
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DTC P0420: Catalyst System Efficiency Below Threshold: Notes

NOTE: Oxygen sensor located in front of catalytic converter is referred to as sensor No. 1. Oxygen sensor located behind catalytic converter is referred to as sensor No. 2.
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