Conditions for Setting the DTC

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

P0131

The ECM detects that the sensor Voltage parameter is less than 50 mV.
DTC P0131 sets within 100 seconds during the lean test when the above condition is met.

P0132

The ECM detects that the sensor parameter is more than 1,050 mV.
DTC P0132 sets within 15 seconds during the rich test when the above condition is met.

P0137

The ECM detects that the sensor voltage parameter is less than 50 mV.
DTC P0137 sets within 100 seconds during the lean test when the above condition is met.

P0138

The ECM detects that the sensor voltage parameter is more than 1050 mV.
DTC P0138 sets within 100 seconds during the rich test when the above condition is met.