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Home › GMC › 1998 › Forward Control 7.4 B › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes - 7.4L › Diagnostic Trouble Codes › DTC P0420 - TWC System Low Efficiency Bank 1 › Notes

DTC P0420 - TWC System Low Efficiency Bank 1: Notes

NOTE: For circuit reference, see WIRING DIAGRAMS - 7.4L article.
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