Conditions for Setting the DTC
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 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 greater than 2 volts within 40 milliseconds of the HO2S heater switching OFF.
- The above condition occurs 5 times out of 6 as the heater is turned OFF.