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Wiring diagrams Section: Testing & Diagnostics

Engine Controls - 3.5L - Introduction (1 of 2)

Engine Controls - 3.9L - Introduction (1 of 2)

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P0133 (2) Chevrolet Uplander I

Testing & Diagnostics

The ECM detects that the HO2S 1 rich-to-lean and lean-to-rich transition time takes longer than a calibrated value.
This diagnostic runs once per trip.