P0139,P0133,P0159,P0153, O2 Sensor Slow Response

P0139, P0133, P0159, P0153 code - for an aged O2 sensor, the response rate to the air/fuel change is slower than when it was new. The O2 sensor tends to move less with the same air/fuel changes in a given time frame. Therefore by observing the activity of voltage readings from the O2 sensor, the quality of the O2 sensor can be detected.

P0139 O2 Sensor Slow Response (Bank 1 Sensor 2)

The downstream O2 sensor is located in the exhaust path behind the catalytic converter, and is monitored for proper response to assure optimum catalytic converter efficiency. This occurs by monitoring the change in the downstream O2 sensor voltage over time, when the fuel is sut off during a decel condition after the enable conditions were met. If the slope of the downstream O 2sensor is too small, the monitor will fail indicating that the O2 sensor is not reliable enough to monitor catalytic converter efficiency.

When monitored:
  • Closed loop fuel control.
  • Engine run time greater than one minute.
  • With the Engine Coolant Temperature sensor above 70°C (158°F).
  • Engine speed above 1500 rpm.
  • Vehicle speed above 138.2 km/h (59 mph).
  • Catalytic Converter temperature between 500°C and 850°C (932°F and 1562°F).
During a decel fuel shutoff event, the Downstream Oxygen sensor should switch from rich to lean within a specific time.

Set condition, if the PCM does not detect a rich to lean switch a specific time during a decel fuel shutoff event, the monitor will fail. Default action the MIL light will illuminate.

Possible causes:
  • Exhaust leak.
  • O2 sensor signal circuit.
  • O2 sensor return circuit.
  • O2 sensor.

How to fix diagnose P0139,P0133,P0159,P0153?

Step 1. Check active DTC
Check for contaminants that may have damage the O2 sensor contaminated fuel, unapproved silicone, oil and coolant. After the repairs have been made, verify proper O2 sensor operation. If all the O2 sensor voltage readings have not returned to normal, follow the diagnostic procedure for the remaining O2 sensors. Start the engine, allow the engine to reach normal operating temperature.

Warning : When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

Test drive or operate the vehicle in accordance with the when monitored and set conditions. With the scan tool, read DTC.

Is the DTC active or pending?

Yes, go to step 2.
No, perform the PCM intermittent condition.

Step 2. Checking the Exhaust system for leaks
Perform the CHECKING THE EXHAUST SYSTEM FOR LEAKS test procedure on the sitemaps/labels this site.

Were any exhaust leaks found?

Yes, repair or replace the leaking exhaust parts as necessary.
No, go to step 3.

Step 3. Check the O2 sensor signal circuit
Turn the ignition off, disconnect the O2 sensor harness connector. Turn the ignition on, measure the voltage on the O2 sensor signal circuit in the O2 sensor harness connector.

Is the voltage between 4.1 and 5.0 volts?

Yes, go to step 4.
No, check the O2 sensor signal circuit for a short to ground, open, or short to voltage. If problems are not found, replace and program the Powertrain Control Module (PCM). Perform the Powertrain Verification Test.

Step 4. Check the O2 sensor return circuit
Measure the voltage on the O2 sensor return circuit in the O2 sensor harness connector.

Is the voltage at 2.5 volts?

Yes, go to step 5.
No, check the O2 sensor return circuit for a short to ground, open, or short to voltage. If no problems are found, replace and program Powertrain Control Module (PCM). Perform the Powertrain Verification Test.

Step 5. O2 sensor
Check for signs of contaminants that may have damaged the O2 sensor, such as contaminated fuel, unapproved silicone, oil, and coolant.

Using the wiring diagrams/scematic as a guide, inspect the wiring and connectors between the Oxygen sensor and the Powertrain Control Module (PCM).
  • Look for any chafed, pierced, pinched, or partially broken wires.
  • Look for broken, bent, pushed out or corroded terminals.
  • Verify that thre is good pin to terminal contact in the O2 sensor and Powertrain Control Module (PCM) connectors.
  • Perform any Service Bulletins that may apply.

Were any problems found?

Yes, repair as necessary.
No, replace the Oxygen sensor.

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