P0137 Mitsubishi Code - Cylinder 1-4 Heated Oxygen Rear Sensor Circuit Low Voltage
Quick Answer
The P0137 code for Mitsubishi indicates a problem with the Cylinder 1-4 Heated Oxygen Rear Sensor Circuit, specifically detecting low voltage. Common causes include Faulty Oxygen Sensor: The most common cause of this code is a malfunctioning or failed oxygen sensor, Wiring Issues: Damage or corrosion to the wiring harness connected to the oxygen sensor can disrupt the voltage signal, Exhaust System Leaks: Leaks in the exhaust system can introduce excess oxygen into the exhaust stream, affecting sensor readings. 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
- P0137 Mitsubishi indicates Cylinder 1-4 Heated Oxygen Rear Sensor Circuit Low Voltage.
- Common causes
- Common causes include Faulty Oxygen Sensor: The most common cause of this code is a malfunctioning or failed oxygen sensor, Wiring Issues: Damage or corrosion to the wiring harness connected to the oxygen sensor can disrupt the voltage signal, Exhaust System Leaks: Leaks in the exhaust system can introduce excess oxygen into the exhaust stream, affecting sensor readings.
- 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.
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Code P0137 Mitsubishi Description
The P0137 code for Mitsubishi indicates a problem with the Cylinder 1-4 Heated Oxygen Rear Sensor Circuit, specifically detecting low voltage. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module to adjust the air-fuel mixture for optimal performance and emissions. When the voltage from the sensor is lower than expected, it can lead to incorrect fuel mixture adjustments, impacting the vehicle's performance and emissions output.
Common Causes of P0137 Mitsubishi
- Faulty Oxygen Sensor: The most common cause of this code is a malfunctioning or failed oxygen sensor.
- Wiring Issues: Damage or corrosion to the wiring harness connected to the oxygen sensor can disrupt the voltage signal.
- Exhaust System Leaks: Leaks in the exhaust system can introduce excess oxygen into the exhaust stream, affecting sensor readings.
- Engine Misfire: A misfiring cylinder can lead to unburned fuel passing through the exhaust, affecting oxygen sensor readings.
- Exhaust System Blockage: A blocked or restricted exhaust system can impact the flow of exhaust gases, affecting sensor performance.
Symptoms of P0137 Mitsubishi
- Check Engine Light: The most common symptom associated with this code is the illumination of the Check Engine light on the dashboard.
- Poor Fuel Economy: A faulty oxygen sensor can cause the engine to run rich or lean, resulting in decreased fuel efficiency.
- Rough Idle: An incorrect air-fuel mixture can lead to a rough or unstable idle when the vehicle is at a standstill.
- Decreased Engine Performance: The engine may struggle to accelerate or respond quickly to throttle input.
- Failed Emissions Test: If the oxygen sensor is not functioning properly, it can cause the vehicle to fail emissions tests due to increased emissions output.
How to Fix P0137 Mitsubishi
- Diagnose the Issue: Use a diagnostic scan tool to confirm the P0137 code and pinpoint the exact cause of the low voltage reading.
- Inspect Wiring: Check the wiring harness connected to the oxygen sensor for any damage, corrosion, or loose connections.
- Replace Oxygen Sensor: If the sensor is faulty, replace it with a new, OEM-quality oxygen sensor compatible with your Mitsubishi model.
- Clear Codes: After making the necessary repairs, clear the diagnostic trouble codes (DTCs) from the vehicle's ECU to reset the Check Engine light.
- Test Drive: Take the vehicle for a test drive to ensure the issue has been resolved and that the oxygen sensor is providing accurate readings.
Cost to Fix P0137 Mitsubishi
The typical repair costs for addressing a P0137 code on a Mitsubishi can range from $150 to $300, including parts and labor. However, 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. It's advisable to check local rates for a more precise estimate.
Tech Notes for P0137 Mitsubishi
When is the Code Detected?
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Frequently Asked Questions about P0137 Mitsubishi Code
1. What does the OBDII code P0137 mean on a Mitsubishi?
P0137 indicates that the rear heated oxygen sensor (Bank 1, Sensor 2) is reporting a low voltage, which suggests an issue with the sensor or its circuit.
2. What are the common symptoms of code P0137 in a Mitsubishi?
Symptoms may include the check engine light turning on, decreased fuel efficiency, poor engine performance, or a failed emissions test.
3. What causes the P0137 code to trigger in a Mitsubishi?
Common causes include a faulty oxygen sensor, damaged or corroded wiring, exhaust leaks, or a malfunctioning engine control module (ECM).
4. Can I drive my Mitsubishi with a P0137 code?
You can drive with this code temporarily, but prolonged operation may lead to poor fuel economy and potential damage to the catalytic converter.
5. How do I fix the P0137 code on my Mitsubishi?
Repairs may involve replacing the rear oxygen sensor, repairing damaged wiring, fixing exhaust leaks, or, in rare cases, replacing the ECM.
6. How can I diagnose the P0137 code on a Mitsubishi?
Start by visually inspecting the wiring and connectors for damage or corrosion, check for exhaust leaks, and test the oxygen sensor with a multimeter.
7. How much does it cost to fix the P0137 code on a Mitsubishi?
Replacing the oxygen sensor typically costs $100–$300, including parts and labor, but costs may vary depending on the exact issue.
8. What happens if I ignore the P0137 code in my Mitsubishi?
Ignoring the code may lead to reduced fuel efficiency, increased emissions, and potential damage to the catalytic converter over time.
9. Can a bad catalytic converter cause a P0137 code in a Mitsubishi?
Yes, a failing catalytic converter can affect exhaust gas flow, potentially causing the rear oxygen sensor to report low voltage.
10. Will clearing the P0137 code solve the problem in my Mitsubishi?
Clearing the code will turn off the check engine light temporarily, but the issue will reoccur unless the underlying problem is fixed.
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