P0133 - O2 Circuit Slow Response (Bank 1, Sensor 1)

4-28 Powertrain DTC Charts and Descriptions

Diagnostic Trouble Code (DTC) Charts and Descriptions

P0133 - O2 Circuit Slow Response (Bank 1, Sensor 1)

Description: The PCM monitors oxygen sensor response time by commanding a calibrated fuel control routine. This routine

sets the air fuel ratio to a calibrated limit to produce a predictable oxygen sensor signal amplitude. This DTC sets when the oxygen sensor signal does not reach the predicted amplitude within a predetermined response time.

Possible Causes: • Exhaust leaks

• Incorrect fueling

• Mass airflow (MAF) sensor (if equipped)

• Intake air leaks

• Contaminated universal heated oxygen sensor bank 1, sensor 1 (HO2S11) (if equipped)

• Contaminated HO2S11 (if equipped)

• Deteriorating universal HO2S11 (if equipped)

• Deteriorating HO2S11 (if equipped)

Diagnostic Aids:

Application Key On Engine Off Key On Engine Running Continuous Memory

KA GO to Pinpoint Test DW.

All others GO to Pinpoint Test DZ.

P0134 - O2 Circuit No Activity Detected (Bank 1, Sensor 1)

Description: If the sensor signal value is not changing from the default value, the PCM commands an oscillating air to fuel

ratio attempting to detect some movement in the signal value. This DTC sets when the PCM is unable to detect movement in the sensor signal while the air to fuel ratio is oscillating.

Possible Causes: • UO2SPC11 circuit open (if equipped)

• HO2S11 circuit open (if equipped)

• Deteriorating universal heated oxygen sensor bank 1, sensor 1 (HO2S11) (if equipped)

• Deteriorating HO2S11 (if equipped)

Diagnostic Aids:

Application Key On Engine Off Key On Engine Running Continuous Memory

KA GO to Pinpoint Test DW.

All others GO to Pinpoint Test DZ.

P0135 - O2 Heater Circuit (Bank 1, Sensor 1)

Description: This DTC sets when an open or short circuit is detected or the heater current draw exceeds a calibrated limit.

Possible Causes: • UO2SHTR11 circuit open (if equipped)

• UO2SHTR11 circuit short to voltage (if equipped)

• HTR11 circuit open (if equipped)

• HTR11 circuit short to voltage (if equipped)

• VPWR circuit open

• Low battery voltage

• Water in the harness connector

• Corrosion

• Incorrect connections

• Damaged universal heated oxygen sensor bank 1, sensor 1 (HO2S11) heater (if equipped)

• Damaged HO2S11 heater (if equipped)

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

Application Key On Engine Off Key On Engine Running Continuous Memory

KA GO to Pinpoint Test DW.

All others GO to Pinpoint Test DZ.

P0136 - O2 Circuit (Bank 1, 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: • HO2S12 circuit open

• SIGRTN circuit open

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