Circuit/System Verification

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: If any DTCs other than DTC P0171 or P0172 are also set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

Allow the engine to reach operating temperature. With the engine running, observe the HO2S parameter with a scan tool. The HO2S 1 value should vary from approximately 40 mV to approximately 900 mV and respond to fueling changes.
- If the value does not vary from approximately 40 mV to approximately 900 mV, refer to DTC P0131, P0132 or P0134 , DTC P0133, P1133 or P2A00 ,DTC P0030, P0053 or P0135 , DTC P0137, P0138 or P0140 , DTC P2A01 or DTC P0036, P0054 or P0141 .
The normal Short Term FT parameter should be moving rapidly between +10 percent and -10 percent, with near 0 percent the optimum, with the engine running at operating temperature.
The Long Term FT parameter should be moving slowly between +10 percent and -10 percent, with near 0 percent the optimum, with the engine running at operating temperature.