When a driver sees the check engine light come on, it can be a cause for concern. One of the most common codes that can trigger this warning is the P0137 code. This code is related to the oxygen sensor circuit and indicates that there is low voltage in the system. Understanding what this code means, its symptoms, and how to diagnose and repair it can help drivers avoid costly repairs down the line.
Need tools for your project? Toolbox, a tool rental marketplace, might be worth a look.
The P0137 code is often associated with the Bank 1 Sensor 2 oxygen sensor. This sensor is responsible for monitoring the amount of oxygen in the exhaust gas and providing feedback to the engine control module (ECM). When there is low voltage in the oxygen sensor circuit, it can cause a range of issues, including reduced fuel efficiency and increased emissions. By diagnosing and repairing this issue, drivers can ensure that their vehicle is running smoothly and efficiently.
Key Takeaways
- The P0137 code indicates low voltage in the oxygen sensor circuit.
- Symptoms of this code may include reduced fuel efficiency and increased emissions.
- Diagnosing and repairing this issue can help drivers avoid costly repairs down the line.
Understanding P0137
What Is P0137 Code?
P0137 is a diagnostic trouble code that is triggered when the powertrain control module (PCM) detects a low voltage reading in the oxygen sensor circuit. Specifically, it is related to the Bank 1 Sensor 2 oxygen sensor. The oxygen sensor is an important component of the vehicle’s emission control system. It measures the amount of oxygen in the exhaust gas and sends this information to the PCM to adjust the air-fuel ratio.
How Oxygen Sensors Work
Oxygen sensors are located in the exhaust system of the vehicle. They are designed to measure the amount of oxygen in the exhaust gas. There are two types of oxygen sensors: the upstream oxygen sensor (also known as the front oxygen sensor) and the downstream oxygen sensor (also known as the rear oxygen sensor). The upstream oxygen sensor is located before the catalytic converter, while the downstream oxygen sensor is located after the catalytic converter.
The oxygen sensor works by producing a voltage signal that is proportional to the amount of oxygen in the exhaust gas. When the oxygen content is high, the voltage signal is high, and when the oxygen content is low, the voltage signal is low. The PCM uses this voltage signal to adjust the air-fuel ratio to ensure optimal engine performance and reduce emissions.
In conclusion, the P0137 code is related to a low voltage reading in the oxygen sensor circuit. Oxygen sensors are crucial components of the vehicle’s emission control system, and they work by measuring the amount of oxygen in the exhaust gas. If the oxygen sensor is faulty, it can cause the low voltage reading that triggers the P0137 code.
Symptoms of P0137
When a vehicle’s oxygen sensor circuit is experiencing low voltage, it can trigger the P0137 trouble code. This can lead to several symptoms that can affect the vehicle’s performance.
Check Engine Light and Error Codes
One of the most common symptoms of P0137 is the illumination of the check engine light. This light can be triggered by a variety of issues, but P0137 is one of the most common causes. When the check engine light comes on, it is important to have the vehicle diagnosed as soon as possible to prevent further damage.
In addition to the check engine light, the vehicle’s onboard computer may also store error codes related to the oxygen sensor circuit. These codes can be read using an OBD-II scanner and can provide valuable information for diagnosing the issue.
Engine Performance Issues
Another symptom of P0137 is a decrease in engine performance. This can manifest in several ways, including reduced fuel efficiency, rough idling, and decreased power output. The oxygen sensor is an important component in the engine’s air/fuel ratio, and when it is not functioning properly, it can cause the engine to run poorly.
If left unchecked, P0137 can cause damage to other components in the vehicle and lead to more serious issues down the line. It is important to have the issue diagnosed and repaired as soon as possible to prevent further damage.
In summary, P0137 can cause several symptoms that can affect the vehicle’s performance. These include the illumination of the check engine light and error codes related to the oxygen sensor circuit, as well as a decrease in engine performance. If you are experiencing any of these symptoms, it is important to have your vehicle diagnosed and repaired by a qualified mechanic.
Diagnosing P0137 Code
Tools Required for Diagnosis
To diagnose the P0137 trouble code, a few tools are required. The first tool needed is a multimeter. The multimeter is used to test the oxygen sensor, which is located in the exhaust system. The mechanic will use the multimeter to check the voltage level of the oxygen sensor. If the voltage level is low, then the oxygen sensor may be faulty. The second tool needed is a diagnostic scanner. The diagnostic scanner is used to read the P0137 trouble code from the car’s computer.
Step-by-Step Diagnosis Procedure
The following is a step-by-step procedure for diagnosing the P0137 trouble code:
- Connect the diagnostic scanner to the car’s computer and read the P0137 trouble code.
- Inspect the oxygen sensor. The oxygen sensor is located in the exhaust system and measures the amount of oxygen in the exhaust gases. If the sensor is faulty, it can cause the low voltage reading that triggers the P0137 code. To inspect the oxygen sensor, use a multimeter.
- Check the wiring and connections. If the oxygen sensor is not faulty, then check the wiring and connections for any damage or corrosion.
- Check the exhaust system for leaks. A leak in the exhaust system can cause the oxygen sensor to give a low voltage reading.
- Replace the oxygen sensor. If the oxygen sensor is faulty, then it needs to be replaced.
Overall, diagnosing the P0137 trouble code requires a few tools and a step-by-step procedure. By following the steps above, a mechanic can diagnose and fix the P0137 trouble code.
Common Causes of P0137
P0137 is a code that is triggered when there is low voltage in the oxygen sensor circuit. This can be caused by a variety of issues, including exhaust leaks and electrical problems. Here are some common causes of P0137:
Exhaust Leaks
One of the most common causes of P0137 is an exhaust leak. When there is a leak in the exhaust system, it can cause the oxygen sensor to read incorrectly, which can lead to low voltage readings. Exhaust leaks can be caused by a variety of issues, including corrosion and damage to the exhaust system.
Electrical Issues
Another common cause of P0137 is an electrical issue. This can include problems with the wiring in the oxygen sensor circuit or corrosion on the connectors. When there is an issue with the electrical system, it can cause the oxygen sensor to read incorrectly, which can lead to low voltage readings.
It is important to note that there are other potential causes of P0137, including a faulty oxygen sensor, excessively high or low fuel pressure, and an engine that is running either very lean or very rich. If you are experiencing issues with P0137, it is important to have your vehicle inspected by a qualified technician to determine the root cause of the problem.
Repairing P0137 Code
When a P0137 code is detected, it means that there is low voltage in the oxygen sensor circuit. This code is usually associated with the Bank 1 Sensor 2 oxygen sensor. Here are some steps to repair this issue.
Replacing the O2 Sensor
If the preliminary checks have been performed and the issue is still not resolved, then it is possible that the O2 sensor needs to be replaced. The following steps can be taken to replace the O2 sensor:
- Locate the O2 sensor that needs to be replaced.
- Disconnect the electrical connector from the sensor.
- Remove the sensor using an O2 sensor socket or a wrench.
- Install the new sensor and tighten it to the manufacturer’s specifications.
- Reconnect the electrical connector.
Fixing Wiring and Electrical Connections
If the O2 sensor has been replaced and the issue is still not resolved, then it is possible that there is a problem with the wiring or electrical connections. The following steps can be taken to fix any wiring or electrical connection issues:
- Inspect the wiring harness for any damage or corrosion.
- Repair any damaged or corroded wiring.
- Inspect the electrical connector for any damage or corrosion.
- Repair any damaged or corroded connectors.
- Ensure that all connections are secure and properly seated.
It is important to note that if the issue is not resolved after performing these steps, then it may be necessary to seek professional assistance.
Preventing P0137 Issues
P0137 is a common issue that can be prevented with regular vehicle maintenance and professional inspections. Here are some tips to help prevent P0137 issues.
Regular Vehicle Maintenance
Regular vehicle maintenance is essential for preventing P0137 issues. It is recommended to follow the manufacturer’s maintenance schedule to keep the vehicle in good condition. Here are some things to keep in mind:
- Replace the oxygen sensor as per the manufacturer’s recommended interval.
- Check the exhaust system for leaks and repair them as soon as possible.
- Keep the engine running at the correct air/fuel ratio to prevent the sensor from being damaged.
Professional Inspections
Regular inspections by a professional mechanic or shop can help prevent P0137 issues. Here are some things to keep in mind:
- Have the oxygen sensor inspected during routine maintenance.
- Have the exhaust system inspected for leaks.
- Have the engine inspected for any issues that could affect the air/fuel ratio.
By following these tips, vehicle owners can prevent P0137 issues and keep their vehicle running smoothly. It is important to note that if the P0137 code is detected, it should be diagnosed and repaired as soon as possible to prevent further damage to the vehicle.
Frequently Asked Questions
How can I diagnose issues related to the P0137 O2 sensor low voltage code?
To diagnose issues related to the P0137 O2 sensor low voltage code, you should start by performing a few preliminary checks. These include checking for loose connections, damaged wiring, and vacuum leaks. You can also use a scan tool to check the voltage readings from the O2 sensor and compare them to the manufacturer’s specifications. If you are still having trouble diagnosing the issue, it is best to consult a professional mechanic.
What are common symptoms of a P0137 trouble code?
Common symptoms of a P0137 trouble code include reduced fuel economy, poor engine performance, rough idling, and an illuminated check engine light. In some cases, the vehicle may also fail an emissions test.
Could a failing O2 sensor be the reason for my check engine light to come on?
Yes, a failing O2 sensor can be the reason for your check engine light to come on. The O2 sensor plays a crucial role in regulating the air-fuel mixture in your engine. When it fails, it can cause a variety of issues that may trigger the check engine light.
What steps should I take to fix an oxygen sensor with low voltage?
If you have a P0137 code, it means that there is low voltage in the oxygen sensor circuit. To fix this issue, you should start by checking for loose connections and damaged wiring. If that doesn’t solve the problem, you may need to replace the O2 sensor. It is best to consult a professional mechanic to determine the best course of action.
Is it possible for a faulty exhaust system to trigger a P0137 code?
Yes, a faulty exhaust system can trigger a P0137 code. If there is a leak in the exhaust system, it can cause the O2 sensor to read incorrect readings, which may trigger the code. It is important to have your exhaust system inspected regularly to prevent issues like this from occurring.
How often should oxygen sensors be replaced to avoid low voltage problems?
Oxygen sensors typically last between 50,000 and 100,000 miles, depending on the make and model of your vehicle. It is important to have your O2 sensors inspected regularly to ensure they are functioning properly. If you are experiencing low voltage problems, it may be time to replace your oxygen sensors.
