P0137 OBD-II Trouble Code: O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0137 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0137 code

P0137 is a diagnostic trouble code (DTC) for "O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0137 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P0137 code definition

O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)

What the P0137 code means

P0137 is the OBD-II generic code indicating the O2 sensor for bank 1 sensor 2 is failing to increase the voltage output above .21 volts indicating excessive oxygen in the exhaust.

This code occurs when the engine control module (ECM) sees the voltage of the O2 sensor for bank 1 sensor 2 below .21 volts when the ECM has commanded the fuel to a targeted rich condition on that bank of the engine.

What causes the P0137 code?

  • The ECM detects the low voltage problem and turns on the Check Engine Light.

  • The ECM uses other O2 sensors to try and control the fuel injection with their values.

  • Exhaust leaks

What are the symptoms of the P0137 code?

  • The engine will run rich during the testing of the sensor for problems.
  • The Check Engine Light will be illuminated.
  • You may have exhaust leaks before or near the O2 sensor in question.

How does a mechanic diagnose the P0137 code?

  • Scans codes and documents freeze frame data then clears codes to verify failure.

  • Monitors O2 sensor data to see if the voltage is switching back and forth between low and high at a fast rate compared to other sensors.

  • Checks the O2 sensor wiring and the harness connections for any corrosion in the connections.

  • Checks the O2 sensor for any physical damage or fluid contamination.

  • Checks for exhaust leaks before the sensor.

  • Follows the manufacturer's specific pinpoint tests for further diagnosis.

Common mistakes when diagnosing the P0137 code?

Follow these simple guidelines to prevent misdiagnosis:

  • Repair any exhaust leaks before the sensor to prevent excess oxygen getting into the exhaust stream causing the low voltage readings.

  • Check the O2 sensor for oil or coolant contaminants that could foul the sensor.

  • Repair any harness that is damaged properly to prevent erratic readings from the sensors.

  • Check the removed O2 sensor for damage from a broken catalyst and replace the catalyst if it has come apart.

How serious is the P0137 code?

  • The voltage output from the O2 sensor may be due to exhaust leaks causing the O2 sensors to give low output voltages.

  • The ECM cannot correctly control the fuel-to-air ratio of the engine fuel mixture if any O2 sensor is malfunctioning. This leads to poor fuel mileage and possible premature failure for some engine components.

What repairs can fix the P0137 code?

Additional comments for consideration regarding the P0137 code

The O2 sensor circuit for bank 1 sensor 2 is used to give a voltage feedback to the ECM showing how much oxygen is in the exhaust stream to help the engine control the fuel-to-air ratio better. The low voltage condition is excessive oxygen in the exhaust or problems causing the issue.

Need help with a P0137 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

P0137
Check Engine Light
trouble codes

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0137 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,636

Rating Summary
3,315
161
42
24
94
3,315
161
42
24
94

Lamont

27 years of experience
61 reviews
Lamont
27 years of experience
Always informative and professional
2003 LINCOLN LS - CHECK ENGINE LIGHT IS ON - FAIRFIELD, CALIFORNIA

Noe

33 years of experience
525 reviews
Noe
33 years of experience
Noe explained the engine light issue and gave me a detailed report on what needed to be fixed. I was very impressed with how friendly and knowledgeable he was.
2002 SATURN L300 - CHECK ENGINE LIGHT IS ON - KENT, WASHINGTON

Joe

40 years of experience
576 reviews
Joe
40 years of experience
Thumbs up
2015 CHEVROLET EQUINOX - CHECK ENGINE LIGHT IS ON - SAINT PETERSBURG, FLORIDA

Chet

38 years of experience
393 reviews
Chet
38 years of experience
Chet was very noligable . Easy to understand, and extremely helpful in this situation. I would definitely recommend Chet to anyone.
2007 FORD F-350 SUPER DUTY - CHECK ENGINE LIGHT IS ON - SAN DIEGO, CALIFORNIA

More related articles

How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...
Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...

Related questions

Q: Why is it still misfiring?

Hi there. Check the Exhaust Gas Recirculation valve on the engine. It seems to be sticking on when the engine is running at low idle and causing a misfire as the old exhaust that is burnt is reentering the engine....

Q: Fuel injection issue - 2005 Buick LaCrosse

Hi there. Your vehicle has a sequential fuel injection system. When the computer detects a fault, it converts to port fuel injection (bank to bank/limp mode). The most likely cause could be an electrical short in the odd bank of...

Q: Rransmission slipping causing check engine light to come on hard shifting when warm only first gear is harsh

Hello. From what you describe it would appear that your vehicle may be experiencing some mild to serious transmission issues. If the Check Engine Light is on I would recommend retrieving the trouble codes, as they will likely shed some...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com