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P0146 Mitsubishi Code - Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 3

Quick Answer

The P0146 code in a Mitsubishi vehicle indicates a fault in the Heated Oxygen Sensor (HO2S) Circuit, specifically referring to Bank 1 Sensor 3. Common causes include Faulty Heated Oxygen Sensor (HO2S), Wiring or connector issues, Exhaust leaks. 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
P0146 Mitsubishi indicates Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 3.
Common causes
Common causes include Faulty Heated Oxygen Sensor (HO2S), Wiring or connector issues, Exhaust leaks.
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 11, 2024
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Code P0146 Mitsubishi Description

The P0146 code in a Mitsubishi vehicle indicates a fault in the Heated Oxygen Sensor (HO2S) Circuit, specifically referring to Bank 1 Sensor 3. This sensor is responsible for monitoring the oxygen levels in the exhaust gases, providing crucial data for the engine control unit (ECU) to adjust the air-fuel mixture for optimal combustion. A slow response from this sensor can lead to inefficient fuel consumption, reduced engine performance, increased emissions, and potential damage to the catalytic converter.

OBDII Code P0146 Mitsubishi - Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 3
P0146 Mitsubishi Code - Heated Oxygen Sensor Circuit Slow Response Bank 1 Sensor 3

Common Causes of P0146 Mitsubishi

  1. Faulty Heated Oxygen Sensor (HO2S)
  2. Wiring or connector issues
  3. Exhaust leaks
  4. Engine misfires
  5. Exhaust system damage or leaks

Symptoms of P0146 Mitsubishi

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Check Engine Light illuminated
  4. Increased emissions
  5. Engine hesitation or surging

How to Fix P0146 Mitsubishi

  1. Diagnose the issue using a scan tool to confirm the P0146 code and pinpoint the exact cause.
  2. Inspect the wiring and connectors for any signs of damage or corrosion. Repair or replace as necessary.
  3. Test the HO2S in Bank 1 Sensor 3 to determine if it is functioning properly. Replace the sensor if it is faulty.
  4. Check for exhaust leaks and repair them to ensure proper sensor operation.
  5. Clear the code from the ECU's memory and perform a road test to verify that the issue has been resolved.

Cost to Fix P0146 Mitsubishi

The typical repair costs for addressing a P0146 code in a Mitsubishi vehicle can vary depending on the specific cause of the issue. Replacement Heated Oxygen Sensors can range from $50 to $200, with labor costs adding another $50 to $150 per hour. Overall, the total repair cost for this issue may range from $150 to $500. It's essential to consult with a trusted mechanic or dealership to get an accurate estimate based on your vehicle's make and model, as well as the local labor rates.

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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 P0146 Mitsubishi Code

1. What are the common symptoms of OBDII code P0146 in a Mitsubishi?

The common symptoms of code P0146 include poor fuel economy, rough idling, hesitation or stalling during acceleration, and the illumination of the Check Engine Light.

2. What does the OBDII code P0146 for a Mitsubishi mean?

Code P0146 indicates a slow response from the heated oxygen sensor (HO2S) located on Bank 1 Sensor 3 in the exhaust system.

3. What are the possible causes of OBDII code P0146 in a Mitsubishi?

Common causes of code P0146 include a faulty oxygen sensor, wiring or connector issues, exhaust leaks, fuel system problems, or an issue with the engine control module (ECM).

4. How can I diagnose the issue causing OBDII code P0146 in my Mitsubishi?

To diagnose the issue, you can use an OBDII scanner to retrieve the code and then inspect the oxygen sensor, wiring, and connectors for any visible damage. You may also conduct a resistance test on the sensor to check its functionality.

5. Can I drive my Mitsubishi with OBDII code P0146?

It is not recommended to drive your Mitsubishi with a persistent P0146 code, as it can lead to poor engine performance and potential damage over time. It's best to address the issue promptly.

6. How can I repair OBDII code P0146 in my Mitsubishi?

Repairing code P0146 may involve replacing the faulty oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, addressing fuel system issues, or reprogramming the ECM if necessary.

7. How much does it cost to fix OBDII code P0146 in a Mitsubishi?

The cost of repairing code P0146 can vary depending on the exact cause of the issue and whether you choose to do the repairs yourself or take your Mitsubishi to a mechanic. Costs may range from around $100 to $500 or more.

8. Can a DIY enthusiast fix OBDII code P0146 in a Mitsubishi?

Yes, if you have the necessary tools and knowledge, you may be able to fix code P0146 yourself by following repair guides or consulting with automotive forums. However, if you're unsure, it's always best to seek professional help.

9. How urgent is it to address OBDII code P0146 in my Mitsubishi?

While your Mitsubishi may still be driveable with code P0146, it's essential to address the issue promptly to prevent further damage and ensure optimal engine performance and fuel efficiency.

10. Is it common for the heated oxygen sensor on Bank 1 Sensor 3 to fail in Mitsubishis?

While failures of the heated oxygen sensor on Bank 1 Sensor 3 in Mitsubishis are not extremely common, they can occur due to age, wear, or other underlying issues. Regular maintenance and prompt attention to any related symptoms can help prevent such failures.

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