Conditions For Setting The DTC
WARNING: This page is about a different car, the 2006 Saturn Ion 3 and 2006 Saturn Ion 2. However, it is still accessible from the selected car via links, so may be relevant.
Rich Test
- The ECM detects that the HO2S 2 voltage parameter is more than 1,065 mV.
- DTC P0138 sets during the rich test within 100 seconds when the above condition is met.
Decel Fuel Cutoff Test
- The ECM detects that the HO2S 2 voltage parameter is more than 587 mV.
- DTC P0138 sets during the decel fuel cutoff test within 10 seconds when the above condition is met.