Conditions for Setting the DTC

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The HO2S 2 is between 286-703 mV during the passive test.
One of the following tests fail:
Lean Intrusive Test
- The PCM detects that the HO2S 2 is more than 286 mV for 13 seconds.
- The HO2S 1 is less than 100 mV.
  OR

Rich Intrusive Test

The PCM detects that the HO2S 2 is less than 703 mV for more than 13 seconds.
The HO2S 1 is less than 777 mV.