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P0136 Mitsubishi Code - HO2S12 Circuit Fault

Quick Answer

The diagnostic trouble code P0136 for Mitsubishi vehicles refers to a fault in the HO2S12 circuit. Common causes include Faulty oxygen sensor: The most common cause of this code is a malfunctioning HO2S12 sensor, Wiring issues: Damage or corrosion in the sensor's wiring can also trigger this fault code, Exhaust leaks: Leaks in the exhaust system can affect the sensor's readings and trigger the code. 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 Mitsubishi indicates HO2S12 Circuit Fault.
Common causes
Common causes include Faulty oxygen sensor: The most common cause of this code is a malfunctioning HO2S12 sensor, Wiring issues: Damage or corrosion in the sensor's wiring can also trigger this fault code, Exhaust leaks: Leaks in the exhaust system can affect the sensor's readings and trigger the code.
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 12, 2024
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Code P0136 Mitsubishi Description

The diagnostic trouble code P0136 for Mitsubishi vehicles refers to a fault in the HO2S12 circuit. HO2S stands for Heated Oxygen Sensor, and the number 12 in the code indicates that this sensor is located in bank 1, which is typically the side of the engine where cylinder 1 is located. The oxygen sensor in question is responsible for monitoring the oxygen content in the exhaust gases and sending this information to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion.

OBDII Code P0136 Mitsubishi - HO2S12 Circuit Fault
P0136 Mitsubishi Code - HO2S12 Circuit Fault

Common Causes of P0136 Mitsubishi

  1. Faulty oxygen sensor: The most common cause of this code is a malfunctioning HO2S12 sensor.
  2. Wiring issues: Damage or corrosion in the sensor's wiring can also trigger this fault code.
  3. Exhaust leaks: Leaks in the exhaust system can affect the sensor's readings and trigger the code.
  4. ECM issues: A faulty engine control module can also cause circuit faults in the oxygen sensor.
  5. Fuel system problems: Issues with the fuel system, such as a clogged fuel injector, can impact the sensor's readings.

Symptoms of P0136 Mitsubishi

  1. Decreased fuel efficiency: A faulty oxygen sensor can cause the engine to run rich or lean, leading to decreased fuel efficiency.
  2. Rough idling: The engine may experience rough idling or stalling due to incorrect air-fuel mixture.
  3. Check Engine Light: The illumination of the Check Engine Light is a common symptom associated with this code.
  4. Poor engine performance: The vehicle may lack power or responsiveness due to incorrect fuel mixture ratios.
  5. Failed emissions test: A malfunctioning oxygen sensor can cause the vehicle to fail emissions tests due to increased emissions.

How to Fix P0136 Mitsubishi

  1. Diagnostic scan: Begin by using a diagnostic scanner to retrieve the specific fault code and determine if it is indeed related to the HO2S12 sensor.
  2. Check wiring and connections: Inspect the wiring and connectors leading to the oxygen sensor for any damage or corrosion. Repair or replace as necessary.
  3. Replace oxygen sensor: If the sensor is determined to be faulty, replace it with a new, OEM-quality sensor compatible with your Mitsubishi vehicle.
  4. Clear codes: After completing the repair, clear the fault codes from the ECM's memory to reset the Check Engine Light.
  5. Test drive: Take the vehicle for a test drive to ensure that the issue has been resolved and that the sensor is functioning properly.

Cost to Fix P0136 Mitsubishi

The cost of repairing a HO2S12 circuit fault in a Mitsubishi vehicle can vary depending on the specific model and the underlying cause of the issue. On average, the cost of replacing an oxygen sensor can range from $200 to $400, including parts and labor. Additional costs may be incurred if there are wiring issues or other underlying problems that need to be addressed. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your location and vehicle model.

What does this mean?

Tech Notes for P0136 Mitsubishi

Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.

When is the Code Detected?

It takes more time for the sensor to respond between rich and lean than the specified time.

Need more information about the P0136 Mitsubishi code?

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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 Mitsubishi Code

1. What does the OBDII code P0136 mean for Mitsubishi vehicles?

P0136 indicates a fault in the circuit of the downstream oxygen sensor (HO2S12), which monitors the efficiency of the catalytic converter.

2. What are the common symptoms of code P0136 in a Mitsubishi?

Symptoms may include poor fuel economy, increased emissions, a check engine light, and potential engine performance issues.

3. What causes the P0136 code in Mitsubishi vehicles?

Common causes include a faulty downstream oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine control module (ECM).

4. Can a bad oxygen sensor cause the P0136 code?

Yes, a malfunctioning downstream oxygen sensor is a primary cause of this code.

5. How can I diagnose the P0136 code in a Mitsubishi?

Inspect the downstream oxygen sensor, check for damaged wiring or loose connections, and look for exhaust leaks near the sensor.

6. Can driving with code P0136 damage my Mitsubishi?

While it’s unlikely to cause immediate damage, prolonged driving with this code can lead to reduced fuel efficiency and higher emissions.

7. How do I fix the P0136 code in a Mitsubishi vehicle?

Common fixes include replacing the downstream oxygen sensor, repairing damaged wiring, fixing exhaust leaks, or addressing ECM issues if necessary.

8. Do I need special tools to resolve the P0136 code?

You may need an OBDII scanner to diagnose the code and a wrench or specialized tools to replace the oxygen sensor.

9. How much does it cost to repair the P0136 code in Mitsubishi vehicles?

Repair costs typically range from $150 to $400, depending on whether you need to replace the sensor, repair wiring, or fix an exhaust issue.

10. Can a P0136 code be cleared without repair?

While you can clear the code with an OBDII scanner, it will likely return if the underlying issue isn’t fixed.

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