Conditions for Setting the DTC
WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
Rich Test
- The PCM detects that the HO2S 2 voltage parameter is more than 1,000 mV.
- DTC P0138 sets within 100 seconds during the rich test when the above condition is met.
Decel Fuel Cutoff Test
- The PCM detects that the HO2S 2 voltage parameter is more than 350 mV.
- DTC P0138 sets within 10 seconds during the decel fuel cutoff test when the above condition is met.