P0137 O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)

When it comes to vehicle maintenance, keeping an eye on your oxygen (O2) sensors is crucial. These sensors monitor the amount of oxygen in your car’s exhaust system, which is essential for determining the air-fuel ratio. If an O2 sensor fails, it can lead to poor engine performance and higher emissions.

One common O2 sensor malfunction is the P0137 code. This code indicates that the O2 sensor circuit for bank 1 sensor 2 is malfunctioning.

In this article, we will discuss the symptoms, causes, diagnosis, repair, and prevention of P0137.


The most apparent sign of a malfunctioning O2 sensor is a check engine light. However, there are other symptoms to be aware of, including:

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  • Poor acceleration and engine performance
  • Rough idling
  • Higher fuel consumption
  • Failed emissions test
  • Foul odors coming from the exhaust

If you notice any of these symptoms, it’s essential to get your vehicle checked by a professional mechanic.


There are various reasons that could trigger P0137, including:


If you suspect that your O2 sensor is malfunctioning, you can diagnose the issue yourself if you have the necessary tools, such as a multimeter. However, it’s always recommended to take your car to a professional mechanic.

The mechanic will use an OBD-II scanner to retrieve the trouble code and determine the source of the problem. They may also perform a visual inspection and use a multimeter to test the O2 sensor’s voltage.


The repair process for P0137 will depend on its cause. If the issue is a faulty O2 sensor, the mechanic will need to replace it. If the problem is damaged wiring or connectors, they may need to be repaired or replaced.

If there are exhaust leaks, they will need to be fixed. Malfunctioning fuel injectors may also require repair or replacement. Finally, engine vacuum leaks need to be fixed.


The best way to prevent O2 sensor malfunctions is to keep up with regular vehicle maintenance. This includes changing your oil, replacing air filters, and checking your spark plugs. It’s also essential to replace your O2 sensor before it fails completely.


In conclusion, a P0137 O2 sensor circuit malfunction is a common issue that can lead to poor engine performance and higher emissions. It’s crucial to get your vehicle checked by a professional mechanic if you notice symptoms such as a check engine light, rough idling, or higher fuel consumption.

Regular vehicle maintenance can significantly reduce the likelihood of O2 sensor malfunctions. However, if you do encounter an issue, it’s essential to diagnose and repair it promptly.


Q1. Is it safe to drive with a P0137?
A. It’s not recommended to drive with a P0137 as it can lead to poor engine performance and increased emissions.

Q2. How much does it cost to repair a P0137?
A. The cost of repairing a P0137 will depend on its cause. It can range from a few hundred dollars to over a thousand dollars.

Q3. Can I replace the O2 sensor myself?
A. It’s possible to replace the O2 sensor yourself if you have the necessary tools and experience. However, it’s recommended to have a professional mechanic do it for you.

Q4. How often should I replace my O2 sensor?
A. It’s recommended to replace your O2 sensor every 60,000 to 90,000 miles.

Q5. Can a P0137 cause damage to my engine?
A. While a P0137 won’t directly damage your engine, it can lead to poor engine performance, which can cause other issues if left untreated.