Conditions for Setting the DTC: Notes
WARNING: This page is about a different car, the 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
P0137
- The ECM detects that the HO2S 2 voltage parameter is less than 60 mV.
- DTC P0137 sets within 0.1 second during the lean test when the above condition is met.
P0138
- The ECM detects that the HO2S 2 voltage parameter is more than 1,150 mV.
- DTC P0138 sets within 0.1 second during the rich test when the above condition is met.