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P1137 Mazda Code - Rear O2 Sensor Self Test Fault

Quick Answer

The P1137 diagnostic trouble code (DTC) for Mazda vehicles specifically refers to a Rear O2 Sensor Self Test Fault. Common causes include Faulty rear oxygen sensor: The sensor itself may be malfunctioning and unable to perform self-tests accurately, Wiring issues: Damaged or corroded wiring connecting the rear O2 sensor to the ECM can disrupt communication, Exhaust system leaks: Leaks in the exhaust system can introduce false air into the system, affecting sensor readings. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1137 Mazda indicates Rear O2 Sensor Self Test Fault.
Common causes
Common causes include Faulty rear oxygen sensor: The sensor itself may be malfunctioning and unable to perform self-tests accurately, Wiring issues: Damaged or corroded wiring connecting the rear O2 sensor to the ECM can disrupt communication, Exhaust system leaks: Leaks in the exhaust system can introduce false air into the system, affecting sensor readings.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1137 Mazda Description

The P1137 diagnostic trouble code (DTC) for Mazda vehicles specifically refers to a Rear O2 Sensor Self Test Fault. This code indicates that there is an issue with the rear oxygen sensor's self-test function, which is responsible for monitoring and adjusting the air-fuel mixture in the exhaust system. The rear oxygen sensor is crucial for optimizing engine performance, fuel efficiency, and emissions control.

OBDII Code P1137 Mazda - Rear O2 Sensor Self Test Fault
P1137 Mazda Code - Rear O2 Sensor Self Test Fault

Common Causes of P1137 Mazda

  1. Faulty rear oxygen sensor: The sensor itself may be malfunctioning and unable to perform self-tests accurately.
  2. Wiring issues: Damaged or corroded wiring connecting the rear O2 sensor to the ECM can disrupt communication.
  3. Exhaust system leaks: Leaks in the exhaust system can introduce false air into the system, affecting sensor readings.
  4. ECM software issues: Software glitches or malfunctions in the engine control module can prevent proper communication with the rear oxygen sensor.

Symptoms of P1137 Mazda

  1. Decreased fuel efficiency: A malfunctioning rear O2 sensor can cause the engine to run rich or lean, resulting in poor fuel economy.
  2. Engine misfires: Inaccurate air-fuel mixture adjustments can lead to engine misfires and rough idling.
  3. Check Engine Light: The P1137 code will trigger the Check Engine Light to illuminate on the dashboard.
  4. Reduced engine performance: The engine may feel sluggish or have reduced power output due to incorrect air-fuel mixture.

How to Fix P1137 Mazda

  1. Diagnose the issue: Use a diagnostic scanner to read the code and pinpoint the exact cause of the rear O2 sensor self-test fault.
  2. Inspect sensor and wiring: Check the rear oxygen sensor for damage and inspect the wiring for any issues like breaks or corrosion.
  3. Replace rear oxygen sensor: If the sensor is faulty, replace it with a new, OEM-quality unit to ensure proper functionality.
  4. Repair wiring: If wiring issues are detected, repair or replace damaged wires to restore proper communication.
  5. Clear codes and test drive: After completing the repair, clear the codes from the ECM and test drive the vehicle to ensure the issue is resolved.

Cost to Fix P1137 Mazda

The cost of repairing a P1137 Mazda code can vary depending on the specific cause of the issue and the labor rates in your area. Generally, replacing a rear oxygen sensor can cost between $150 and $300 for the part alone. Labor costs at auto repair shops typically range from $80 to $150 per hour, and the total repair bill can add up to $250 to $500 or more. Keep in mind that additional costs may apply if other components need to be replaced or if there are underlying issues contributing to the fault code. It's recommended to consult with a qualified mechanic for an accurate estimate based on your vehicle's make and model.

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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 P1137 Mazda Code

1. What does the OBDII code P1137 mean on a Mazda?

The P1137 code indicates a "Rear O2 Sensor Self Test Fault," meaning the downstream oxygen sensor has failed its self-diagnostic test.

2. What are the symptoms of a P1137 code on a Mazda?

Common symptoms include the check engine light turning on, poor fuel efficiency, higher emissions, and potentially rough idling or engine performance issues.

3. What causes the P1137 code on a Mazda?

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

4. Can a bad catalytic converter trigger the P1137 code?

While unlikely, a failing catalytic converter can disrupt downstream oxygen sensor readings, potentially contributing to this code.

5. How do you diagnose a P1137 code on a Mazda?

Diagnosis typically involves scanning for additional codes, inspecting the rear O2 sensor and its wiring, and checking for exhaust leaks or ECM issues.

6. Can driving with a P1137 code damage my Mazda?

Driving with this code for an extended period may lead to increased emissions and reduced fuel efficiency, but it typically won’t cause severe engine damage.

7. How do you fix a P1137 code on a Mazda?

Repairs may include replacing the rear O2 sensor, fixing damaged wiring or connectors, repairing exhaust leaks, or reprogramming/updating the ECM.

8. Is it expensive to fix a P1137 code on a Mazda?

The cost depends on the root cause. Replacing a rear O2 sensor usually costs between $100 and $300, including parts and labor.

9. Can a P1137 code clear itself after repairs?

If the issue is resolved, the code may clear after several drive cycles, but resetting it with an OBDII scanner ensures the repair is verified.

10. Can I fix the P1137 code on my Mazda myself?

If you have basic automotive knowledge, you can inspect and replace the rear O2 sensor or repair visible wiring damage. For complex issues, professional help is recommended.

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