Conditions for Setting the DTC
WARNING: This page is about a different car, the 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Condition 1
- The ECM detects that the HO2S 1 is operating too lean while the HO2S 2 is operating too rich and the ECM detects that the fuel trim is at maximum control.
OR
- The rear fuel trim, long and short term, is more than a threshold.
- After the air flow coming into the engine accumulates to more than 200 grams and the above conditions are met, this DTC sets.
Condition 2
- The ECM detects that the HO2S 2 is operating too rich while commanding a lean condition.
- After the air flow coming into the engine accumulates to more than 800 grams and the above condition is met, this DTC sets.