P0154 - O2 Circuit No Activity Detected (Bank 2, Sensor 1)

Powertrain DTC Charts and Descriptions 4-33

Diagnostic Trouble Code (DTC) Charts and Descriptions

P0154 - O2 Circuit No Activity Detected (Bank 2, Sensor 1) (Continued)

Possible Causes: • UO2SPC21 circuit open

• Contaminated universal heated oxygen sensor bank 2, sensor 1 (HO2S21)

Diagnostic Aids:

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test DZ.

P0155 - O2 Heater Circuit (Bank 2, Sensor 1)

Description: This DTC sets when an open or short circuit is detected or the universal heated oxygen sensor bank 2, sensor 1

(HO2S21) heater current draw exceeds a calibrated limit.

Possible Causes: • UO2SHTR21 circuit open

• UO2SHTR21 circuit short to voltage

• VPWR circuit open

• Low battery voltage

• Water in the harness connector

• Corrosion

• Incorrect connections

• Damaged universal HO2S21 heater

Diagnostic Aids: Inspect the connectors for signs of damage, water intrusion or corrosion.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test DZ.

P0157 - O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)

Description: This DTC sets when a concern is detected with one of the circuits used to determine the oxygen content in the

exhaust gas.

Possible Causes: • HO2S22 circuit open

• HO2S22 circuit short to ground

• Damaged heated oxygen sensor bank 2, sensor 2 (HO2S22)

Diagnostic Aids:

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test DW.

P0158 - O2 Circuit High Voltage (Bank 2, Sensor 2)

Description: The heated oxygen sensor bank 2, sensor 2 (HO2S22) signal is monitored for an over voltage condition. This

DTC sets when the HO2S signal voltage is 1.5 volts or greater.

Possible Causes: • HO2S22 circuit short to voltage

Diagnostic Aids: See the diagnostic aids for DTC P0132.

Application Key On Engine Off Key On Engine Running Continuous Memory

All GO to Pinpoint Test DW.

P0159 - O2 Circuit Slow Response (Bank 2, Sensor 2)

Description: The heated oxygen sensor (HO2S) monitor tracks the rate of voltage change during the rise and fall of the

heated oxygen sensor bank 2, sensor 2 (HO2S22) signal. When the rate of voltage change is less than a calibrated value, the PCM begins to modify the fuel trim attempting to increase the HO2S voltage switch rate. This DTC sets when the PCM is at the allowable limit or has exceeded an allowable length of time for fuel trim modification, without detecting an acceptable rate of voltage change.

Possible Causes: • Exhaust leaks

• Aftermarket accessories

• Performance modifications

• Contaminated HO2S22

• Deteriorating HO2S22

2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015