P0137 or P0157
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- The ECM detects that a HO2S 2 signal voltage is less than 60 mV for greater than 5 seconds.
OR
- The ECM detects that a HO2S 2 signal voltage is less than 60 mV after an intrusive test with enrichment of up to 7 percent.