Condition 2
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
- The ECM detects that the rear HO2S is operating too rich while the ECM is commanding a lean air/fuel mixture.
- This DTC sets after the air flow coming into the engine accumulates to more than 800 grams and the above condition is met for more than 4 seconds.