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P0051 Mitsubishi Code - Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low

Quick Answer

The P0051 diagnostic trouble code (DTC) for Mitsubishi vehicles specifically refers to an issue with the Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit being detected as low. Common causes include Faulty oxygen sensor, Damaged wiring or connectors in the front heater control circuit, ECM malfunction. 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
P0051 Mitsubishi indicates Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low.
Common causes
Common causes include Faulty oxygen sensor, Damaged wiring or connectors in the front heater control circuit, ECM malfunction.
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 P0051 Mitsubishi Description

The P0051 diagnostic trouble code (DTC) for Mitsubishi vehicles specifically refers to an issue with the Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit being detected as low. This sensor, also known as the oxygen sensor, plays a crucial role in monitoring the oxygen levels in the exhaust gases of the vehicle. The front heater control circuit is responsible for ensuring that the oxygen sensor operates at the optimal temperature for accurate readings.

OBDII Code P0051 Mitsubishi - Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low
P0051 Mitsubishi Code - Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low

Common Causes of P0051 Mitsubishi

  1. Faulty oxygen sensor
  2. Damaged wiring or connectors in the front heater control circuit
  3. ECM malfunction
  4. Exhaust leaks near the oxygen sensor
  5. Contaminated sensor due to oil or coolant leaks

Symptoms of P0051 Mitsubishi

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Check Engine Light illuminated on the dashboard
  4. Failed emissions test
  5. Reduced engine performance

How to Fix P0051 Mitsubishi

  1. Begin by conducting a visual inspection of the oxygen sensor and its wiring to check for any visible damage or issues.
  2. Use a multimeter to test the resistance of the oxygen sensor's front heater control circuit to determine if it is within the manufacturer's specifications.
  3. If the resistance is out of range, replace the oxygen sensor with a new, OEM-quality sensor.
  4. Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure the issue has been resolved.
  5. If the code persists, further diagnostic testing may be required to identify any underlying issues with the wiring or ECM.

Cost to Fix P0051 Mitsubishi

The typical repair costs for addressing a P0051 code on a Mitsubishi vehicle can range from $150 to $400, including parts and labor. However, it is important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It is advisable to check local rates for a more precise estimate before proceeding with the repair.

What does this mean?

Tech Notes for P0051 Mitsubishi

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors.

When is the Code Detected?

The P0051 is set when the ECM detects an excessively low voltage through the heated oxygen sensor heater circuit

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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 P0051 Mitsubishi Code

1. What are the common symptoms of OBDII code P0051 in a Mitsubishi related to the Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low?

The common symptoms include poor fuel economy, rough idling, decreased engine performance, and an illuminated check engine light.

2. What are the possible causes of OBDII code P0051 in a Mitsubishi for the Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low?

Possible causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or an issue with the engine control module (ECM).

3. How can I diagnose the OBDII code P0051 in a Mitsubishi for the Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low?

Diagnosis involves using an OBDII scanner to retrieve the code, inspecting the wiring and connectors for damage, checking the fuse related to the oxygen sensor, and testing the oxygen sensor itself.

4. What is the repair process for OBDII code P0051 in a Mitsubishi for the Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low?

The repair process may involve replacing the oxygen sensor, repairing or replacing damaged wiring or connectors, checking and replacing the fuse if necessary, and resetting the ECM.

5. Can I drive my Mitsubishi with OBDII code P0051 related to the Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low?

It is not recommended to drive the vehicle with this code present, as it can lead to further damage and poor engine performance. It is best to address the issue as soon as possible.

6. How much does it cost to repair OBDII code P0051 in a Mitsubishi for the Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low?

The cost of repair can vary depending on the specific issue causing the code, but it may range from $100 to $400 for parts and labor.

7. Can a DIY enthusiast fix OBDII code P0051 in a Mitsubishi related to the Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low?

While some experienced DIY enthusiasts may be able to address this issue, it is recommended to have a qualified mechanic diagnose and repair the problem to ensure it is properly fixed.

8. How often does OBDII code P0051 in a Mitsubishi for the Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low occur?

This code can occur sporadically or persistently, depending on the underlying issue. Regular maintenance and prompt repairs can help prevent its occurrence.

9. Is OBDII code P0051 in a Mitsubishi related to the Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low a serious problem?

While the issue may not cause immediate harm to the vehicle, ignoring the code can lead to decreased fuel efficiency, engine performance issues, and potential damage to other components over time.

10. How long does it take to repair OBDII code P0051 in a Mitsubishi for the Cylinder 2-3 Heated Oxygen Sensor Front Heater Control Circuit Low?

The repair time can vary based on the specific cause of the code and the availability of parts. In general, it may take a few hours to a full day to diagnose and repair the issue.

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