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Engine-Codes – Toyota – P0136 Toyota

P0136 Toyota Code - Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

Quick Answer

The P0136 diagnostic trouble code for Toyota vehicles indicates an Oxygen Sensor Circuit Malfunction in Bank 1 Sensor 2. Common causes include Faulty oxygen sensor, Wiring issues or shorts in the oxygen sensor circuit, Exhaust leaks near the sensor. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0136 Toyota indicates Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2.
Common causes
Common causes include Faulty oxygen sensor, Wiring issues or shorts in the oxygen sensor circuit, Exhaust leaks near the sensor.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P0136 Toyota Description

The P0136 diagnostic trouble code for Toyota vehicles indicates an Oxygen Sensor Circuit Malfunction in Bank 1 Sensor 2. This means that there is a problem with the oxygen sensor located downstream of the catalytic converter on the bank 1 side of the engine. The oxygen sensor plays a crucial role in monitoring the oxygen levels in the exhaust gases, which helps the engine control module (ECM) adjust the air-fuel mixture for optimal combustion. When this sensor malfunctions, it can lead to poor engine performance, reduced fuel efficiency, and increased emissions.

OBDII Code P0136 Toyota - Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2
P0136 Toyota Code - Oxygen Sensor Circuit Malfunction Bank 1 Sensor 2

Common Causes of P0136 Toyota

  1. Faulty oxygen sensor
  2. Wiring issues or shorts in the oxygen sensor circuit
  3. Exhaust leaks near the sensor
  4. Contaminated sensor due to oil or coolant leaks
  5. ECM or engine control module failure

Symptoms of P0136 Toyota

  1. Decreased fuel efficiency
  2. Engine hesitation or misfiring
  3. Rough idling
  4. Illuminated check engine light
  5. Failed emissions test

How to Fix P0136 Toyota

  1. Begin by diagnosing the specific cause of the P0136 code using a scan tool and inspecting the oxygen sensor and its wiring.
  2. Replace the faulty oxygen sensor with a new one that matches the specifications for your Toyota vehicle.
  3. Repair any damaged wiring or connectors in the oxygen sensor circuit.
  4. Check for and repair any exhaust leaks near the sensor.
  5. Clear the diagnostic trouble codes and perform a test drive to ensure that the issue has been resolved.

Cost to Fix P0136 Toyota

The typical repair costs for fixing an Oxygen Sensor Circuit Malfunction (P0136) in a Toyota can range from $150 to $400, including parts and labor. It's important to note that the actual cost may vary depending on the specific model of the vehicle, the location of the repair shop, and any additional repairs or diagnostic services required. As mentioned earlier, auto repair shops commonly charge between $80 and $150 per hour for labor, so it's advisable to inquire about local rates for a more accurate estimate.

What does this mean?

Tech Notes for P0136 Toyota

Replacing the Oxygen Sensor Bank 1 Sensor 2 (Rear Oxygen Sensor Bank 1 or Downstream Oxygen Sensor Bank 1) usually takes care of the problem.









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Information for Specific Toyota Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0136 Toyota Code

1. What are the common symptoms of OBDII code P0136 in a Toyota?

The common symptoms of code P0136 include decreased fuel efficiency, rough idling, poor engine performance, and the illumination of the check engine light.

2. What does the OBDII code P0136 for a Toyota indicate?

Code P0136 indicates a malfunction in the oxygen sensor circuit for Bank 1 Sensor 2 in the Toyota's exhaust system.

3. What are the possible causes of OBDII code P0136 in a Toyota?

Possible causes of code P0136 in a Toyota include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine's computer system.

4. How can I diagnose the OBDII code P0136 in my Toyota?

To diagnose code P0136, you can use an OBDII scanner to read the code, visually inspect the oxygen sensor and its wiring, check for exhaust leaks, and perform a voltage test on the sensor.

5. Can I still drive my Toyota with OBDII code P0136?

While it is possible to drive your Toyota with code P0136, it is not recommended as it can lead to decreased fuel efficiency and potential damage to the catalytic converter over time.

6. How can I repair OBDII code P0136 in my Toyota?

Repairing code P0136 may involve replacing the oxygen sensor for Bank 1 Sensor 2, repairing damaged wiring or connectors, fixing exhaust leaks, or resetting the engine's computer system.

7. Is it possible to reset the check engine light after fixing OBDII code P0136 in a Toyota?

Yes, you can reset the check engine light using an OBDII scanner after fixing the issue causing code P0136 in your Toyota.

8. Are there any DIY tips for troubleshooting OBDII code P0136 in a Toyota?

DIY tips for troubleshooting code P0136 include checking for visible damage to the oxygen sensor wiring, ensuring proper connection of the sensor, and inspecting the exhaust system for leaks.

9. Can a dirty or clogged air filter cause OBDII code P0136 in a Toyota?

While a dirty or clogged air filter may affect engine performance, it is not a direct cause of code P0136. Focus on checking the oxygen sensor and related components for this particular code.

10. How important is it to address OBDII code P0136 promptly in a Toyota?

It is important to address code P0136 promptly in a Toyota to ensure optimal engine performance, fuel efficiency, and to prevent potential damage to the catalytic converter and other components in the long run.

Discuss the causes and fixes for P0136 Toyota OBDII Code

Submit a New Comment

  • Where is the bank 1 sensor 2 located, exactly? I have a 2002 Highlander and there are 3 sensors.

    Reply to Comment

  • What engine size is your Highlander? Here is the image for the 6 Cylinder engine.

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  • Does anyone Know what color wires from my 1999 Tacoma harness go into the O2 sensor? I had to splice wires onto my harness to reach O2 sensor. O2 sensor wires are 2 black, 1 blue and 1 white. The colors on my wire harness are 1 black, 1 brown, white/red, and red/white. Thanks!

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  • What is the engine size of your Tacoma? ans is for the Rear O2 Sensor correct?

    Reply to Comment

  • It's a V6, 3.4L. And yes, Rear 02 Sensor.

    Reply to Comment

  • Here is the only image of the harness I got. Let me know if you need anything else.

    Image

    Click here to enlarge image

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  • Yes thank you! Can you tell me what the +B and E1 stand for?

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  • +B = Battery Voltage Positive
    E1 = Oxygen Sensor Negative Signal
    OX = Oxygen Sensor Positive Signal
    HT = Oxygen Sensor Heater Control

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  • You are awesome! Thanks...that helps! Let me try that and see if that’s all I need.... This has been very “trying” lol

    Reply to Comment