The Subaru P0137 code is an indication that the oxygen sensor output voltage is lower than the normal operating conditions. This code is a common problem that can lead to other issues with the Subaru vehicle, such as reduced engine performance and decreased fuel efficiency. In this article, we will discuss the causes, symptoms, and solutions to the Subaru P0137 code. We will review the related service bulletins to provide you with the best information to fix the Subaru P0137 code.
Causes and Solutions of Subaru P0137 Code
| Cause | Solution |
|---|---|
| Water in the front oxygen sensor connector or coupling connector | Replace the connector and coupling |
| Wiring harness between ECM and rear oxygen sensor connector needs repair | Repair the wiring harness |
| Loose or damaged exhaust system parts | Replace the damaged parts |
| Defective rear oxygen sensor | Replace the oxygen sensor |
Water in the Front Oxygen Sensor Connector or Coupling Connector
The first cause of the Subaru P0137 code is water in the front oxygen sensor connector or coupling connector. This can lead to a buildup of moisture in the connector, which can cause a voltage drop in the rear oxygen sensor. To fix this issue, the connector and coupling need to be replaced.
Wiring Harness Between ECM and Rear Oxygen Sensor Connector Needs Repair
The second cause of the Subaru P0137 code is a wiring harness that needs to be repaired. This can be caused by a damaged or corroded wire or a faulty connector. To fix this issue, the wiring harness needs to be inspected and any damaged or corroded components should be repaired or replaced.
Loose or Damaged Exhaust System Parts
The third cause of the Subaru P0137 code is a loose or damaged exhaust system part. This can cause the rear oxygen sensor to be exposed to exhaust gases, which can lead to a false signal. To fix this issue, the exhaust system needs to be inspected and any damaged or loose parts should be replaced.
Defective Rear Oxygen Sensor
The fourth cause of the Subaru P0137 code is a defective rear oxygen sensor. This can lead to a false signal being sent to the ECM, which can cause the engine to misfire or run rough. To fix this issue, the oxygen sensor should be replaced with a new one.
Conclusion
The Subaru P0137 code is an indication that the oxygen sensor output voltage is lower than the normal operating conditions. This code is a common problem that can lead to other issues with the Subaru vehicle, such as reduced engine performance and decreased fuel efficiency. In this article, we have discussed the causes, symptoms, and solutions to the Subaru P0137 code. We have reviewed the related service bulletins to provide you with the best information to fix the Subaru P0137 code. The causes of the Subaru P0137 code include water in the front oxygen sensor connector or coupling connector, a wiring harness that needs to be repaired, loose or damaged exhaust system parts, and a defective rear oxygen sensor. By taking the necessary steps to diagnose and repair the Subaru P0137 code, you will be able to restore the performance of your Subaru vehicle and get back on the road safely.
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