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Tahoe PPV, RWD
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Different variant/trim
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Section 11 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (2 Of 5))
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Diagnostic Information and Procedures
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DTC P0421
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Conditions for Clearing the DTC
Conditions for Clearing the DTC
WARNING:
This page is about a different variant/trim than selected.
DTCs listed in the DTC Descriptor Category = Type A DTC