Conditions for Setting the DTC
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 HO2S signal voltage increases more than 2 volts in less than 1 second of the HO2S heater switching OFF.
- The above condition occurs 4 times out of 6 as the heater is turned OFF.