Conditions for Setting the DTC: P2A01

WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

The HO2S 2 parameter is between 250-715 mV during the passive test.
One of the following tests fail:
Lean Intrusive Test
- The ECM detects that the HO2S 2 voltage is more than 250 mV.
- The ECM detects that the HO2S 1 voltage is less than 100 mV.
  Rich Intrusive Test
  - The ECM detects that the HO2S 2 voltage is less than 715 mV.
  - The ECM detects that the HO2S 1 voltage is more than 800 mV.
This diagnostic runs once per trip.