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.
- The ECM detects that the HO2S signal voltage is switching at the same rate as the heater control.
- The above condition occurs 4 times out of 6 as the heater is turned OFF.