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Home >> Toyota >> 1997 >> Supra 3.0 D, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Tests W/Codes - Non-Turbo >> Circuit Tests >> DTC P0420: Catalyst System Efficiency Below Threshold >> Notes
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DTC P0420: Catalyst System Efficiency Below Threshold: Notes

NOTE: Sensor No. 1 refers to sensor located in front exhaust manifold. Sensor No. 2 refers to sensor located in rear exhaust manifold. Sensor No. 3 refers to sensor located behind front catalytic converter.
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