P2237 OBD-II Trouble Code: O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1

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

SCHEDULE P2237 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2237 code

P2237 is a diagnostic trouble code (DTC) for "O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1". 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 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$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2237 DIAGNOSTIC Get a fair and transparent estimate upfront

What the P2237 code means

P2237 is an OBD-II generic code for the engine control module (ECM) detecting the O2 sensor for bank 1 sensor 1 and has an open circuit for the heater control circuit of the O2 sensor. The ECM tests the sensor circuit after the engine is warmed up.

What causes the P2237 code?

  • The O2 sensor has an open circuit in the heater circuit internal of the sensor.
  • The heater power relay is shorted to the O2 sensor circuit ground.
  • The wiring or connector for the O2 sensor has an open circuit or corrosion in the connections.

What are the symptoms of the P2237 code?

  • The Check Engine light will be illuminated and the code is set in ECM memory as a fault.

  • The ECM will turn off the Check Engine light if three drive cycles pass without another failure.

  • The ECM may go into failure mode fuel control on most manufacturer vehicles.

  • The engine may have different drivability symptoms depending on the manufacture failure mode controls.

How does a mechanic diagnose the P2237 code?

  • Scans for codes and documents the code in the ECM and looks at the freeze frame data for failure.

  • Checks the O2 sensor heater circuit compared to the other O2 sensors to be the same voltage input and control voltages.

  • Checks the O2 heater circuit for open or short circuit in the sensor.

  • Tests the O2 sensor wiring is not shorted to the power relay or ground.

  • Checks the wiring harness for shorts or open circuits from the O2 sensor to the ECM.

Common mistakes when diagnosing the P2237 code?

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired

  • Failing to verify the failure before replacing the O2 sensor

How serious is the P2237 code?

Code P2237 is a code indicating the O2 sensor heater circuit is open or shorted causing the circuit voltage control to be open. This will cause the fuel feedback control to not work and the ECM to put the engine into failure mode. This will also cause the vehicle to fail emissions testing.

What repairs can fix the P2237 code?

  • Replace the O2 sensor for an open circuit in the heater circuit.
  • Repair the wiring connector or wiring to the O2 sensor.
  • Replace the power relay for the heater circuit due to a burned out or shorted circuit that the pinpoint test indicated.

Additional comments for consideration regarding the P2237 code

Code P2237 is caused most commonly from an internal failure of the heater circuit inside the O2 sensor. The O2 sensor wiring cover is also a vent on some O2 sensors and if the cover is cut or removed then the sensor can get water into the back side of the sensor and cause it to short out the heater circuit and blow the O2 sensor heater circuit fuse. Note this if the fuse keeps blowing out when it is replaced. Check all the sensors for intact coverings.

Need help with a P2237 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.

trouble codes
Check Engine Light
P2237

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

SCHEDULE P2237 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

4.8/5

Number of Reviews

4,896

Rating Summary
4,509
187
48
28
124
4,509
187
48
28
124

Travis

11 years of experience
328 reviews
Travis
11 years of experience
Buick LeSabre - Check Engine Light is on - Saint Paul, Minnesota
Travis was fantastic to work with, very prompt, professional and patient. He took the time to explain the diagnostic and my options for repair

Stacy

22 years of experience
112 reviews
Stacy
22 years of experience
Chrysler 200 - Check Engine Light is on - Hampton, Georgia
Very knowledgeable and thorough did a complete inspection and explained everything. Thing’s that I didn’t think were contributing to issues it was having. Awesome mechanic I will continue to book him and his service thanks Stacy

Michael

16 years of experience
2 reviews
Michael
16 years of experience
Mazda 626 - Check Engine Light is on Inspection - Washington, District of Columbia
I did not ask for another quote or another merchanic.ive been trying to get intouch with mr micheal since ill first visit.he told me that there is a problem with the company hes been trying to find out if the parts formy cars price is included in the $460 i want him to fix my car because he. knows whats wrong.he said as soon as he gets an answer from the company he would contact me ive left him numberic message .i deeply wants mr mucheal to fix my car thank you

Victor

9 years of experience
205 reviews
Victor
9 years of experience
Ford Escape - Check Engine Light is on - Virginia Beach, Virginia
Victor is awesome. He is very informative and honest. He took the time to properly diagnose the issue through testing multiple items on the car. What I requested to be replaced what not the actual problem. Great mechanic and I would recommend him for any service. I plan on using him for future services.

More related articles

P2243 OBD-II Trouble Code: O2 Sensor Reference Voltage Circuit Open Bank 1 Sensor 1
What What the P2243 code means? P2243 is an OBD-II generic code for the engine control module (ECM) detecting the O2 sensor for bank 1 sensor 1 having an open circuit for the reference voltage to the O2 sensor. ...
B1999 OBD-II Trouble Code: Passenger Side Side-Mount Air Bag Low Resistance on Squib
B1999 trouble code means there's a circuit malfunction in the passenger side-mount air bag inflator, caused by blown fuses or shorted wires.
P0618 OBD-II Trouble Code: Alternative Fuel Control Module KAM Error
P0618 means an error with the alternative fuel control module, due to its malfunction or electrical issues within the CAN.

Related questions

I replaced the output shaft sensor. Do I need to reset the code?

Try removing the battery cables and letting the computer sit for about 1 minute and then hook up the cables or if you have a scanner that can erase the codes. This will clear the engine light and codes to...

the car has suffocation feeling when accelerator is pressed and does not speed constantly

This sounds like a low fuel pressure problem, or an air filter and mass airflow (MAF) sensor problem. Check the fuel pressure and replace the fuel filter first to see if it helps. Next, have the system computer scanned...

Check Engine and VSA light coming on

Hi there, VSA stands for Vehicle Stability Assist and is Honda's computer system that helps ensure the tires have traction to help keep you on the road. When both the check engine light and the VSA light are illuminated it...

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