What is the P0137 Code?
The P0137 trouble code is a generic powertrain code (OBD-II) that indicates a problem with the low voltage oxygen sensor (O2) circuit on Bank 1, Sensor 2 (B1S2). This sensor, located after the catalytic converter, monitors the catalyst’s efficiency. The code is triggered when the engine control module (ECM) detects that the sensor’s signal voltage has remained abnormally low for more than two minutes.
Symptoms of the P0137 Code
This fault is often silent. The most common symptom is the illumination of the Malfunction Indicator Lamp (MIL) on the dashboard. In some cases, you might also observe:
- A slight increase in fuel consumption
- A slight decrease in engine performance
- Failure of the emissions test
Possible Causes of the P0137 Code
Several malfunctions can cause the P0137 code:
- Faulty O2 sensor: The most common cause.
- Electrical circuit problem: Short circuit, open circuit, or high resistance in the sensor wiring.
- Exhaust leaks: A leak near the rear sensor distorts the readings.
- Faulty catalytic converter: A clogged or inefficient catalyst.
- Air/fuel mixture problems: Engine running too rich or too lean.
- Faulty fuel pressure regulator: Fuel pressure too high or too low.
Diagnosis and Solutions to Fix the P0137 Code
To diagnose and resolve a P0137 code, follow these steps:
- Visual Inspection: Check the sensor’s wiring and connector for any signs of damage or corrosion. Inspect the exhaust system for possible leaks.
- Sensor Test: Using a multimeter or diagnostic tool, measure the O2 sensor’s voltage and resistance to check if it is functioning correctly.
- Catalyst Check: Check the condition and efficiency of the catalytic converter.
- Repair: Depending on the identified cause, proceed with replacing the O2 sensor, repairing the wiring or exhaust system, or replacing the catalyst.
Conclusion and Call to Action
Although the P0137 code often does not make your vehicle immediately undrivable, it should not be ignored. A faulty rear O2 sensor can lead to increased fuel consumption and premature damage to your catalyst, an expensive component.
Experiencing this issue? Our team of professionals is equipped to accurately diagnose the origin of the P0137 code on your vehicle and provide you with a reliable repair. Contact us for a personalized quote and get your vehicle back into optimal running condition.