DTC P0031: Ho2S Heater Control Circuit Low (Bank 1, Sensor 1)

P0031 - HO2S HEATER CONTROL CIRCUIT LOW (BANK 1, SENSOR 1)

Description:	The powertrain control module (PCM) monitors the heater in the heated oxygen sensor (HO2S) for correct operation. The PCM controls the heater on and off duty cycle to maintain a calibrated temperature. The test fails when the sensor does not warm up to the required temperature in a calibrated amount of time. The test also fails when the PCM is not able to maintain the required temperature after the sensor is warm.
Possible Causes:	HO2S heater circuit short in the harness Incorrect connections Damaged or corroded terminals Exhaust temperature significantly higher than expected Damaged HO2S
Diagnostic Aids:	Inspect the connectors for signs of damage, water ingress, or corrosion.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	GO to PINPOINT TEST DW .