P2234 OBD-II Trouble Code: O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 1

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

SCHEDULE P2234 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2234 code

P2234 is a diagnostic trouble code (DTC) for "O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 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 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 P2234 DIAGNOSTIC Get a fair and transparent estimate upfront

P2234 code definition

O2 Sensor Signal Circuit Shorted to Heater Circuit Bank 2 Sensor 1

What the P2234 code means

Code P2234 is an OBD-II generic code for the Engine Control Module (ECM) detecting the O2 sensor signal wire is shorted to the O2 sensor heater circuit.

What causes the P2234 code?

  • The ECM monitors the O2 sensor signal and the heater circuit. The ECM detected the O2 heater and signal return are shorted together.

  • The bank 2 of the engine cannot go into closed loop.

  • The O2 sensor got damaged or is internally shorted.

What are the symptoms of the P2234 code?

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

  • The engine will run lean on bank two and the engine may run rough and misfire.

  • The engine may hesitate on acceleration.

  • The ECM will go into open loop and possible failure mode depending on the failure strategy of the computer programming.

How does a mechanic diagnose the P2234 code?

  • Scan for codes and document the codes in the ECM and look at the freeze frame data for failure.

  • Monitor the O2 sensors for bank 2 while manually enrichening mixture with propane to see if the O2 sensor indicates rich and lean.

  • Check the O2 sensor and wiring for physical damages.

  • Follow the manufacturer pinpoint tests for the diagnosis and replacement of the O2 sensor on bank 2 sensor 1.

Common mistakes when diagnosing the P2234 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 clear the ECM codes after the codes are fixed so the ECM will enable the system to operate normal again.

  • Failing to check the harness for shorts in the harness or connector.

How serious is the P2234 code?

Code P2234 is a code indicating that the engine is in open loop and not going into closed loop fuel control. The shorted sensor can burn out the circuit in the ECM for the O2 sensor.

What repairs can fix the P2234 code?

  • Repair a melted harness and connector.

  • Replacing the O2 sensor for bank two.

  • Rechecking the system to make sure it goes into closed loop and the O2 sensors are reading correctly.

Additional comments for consideration regarding the P2234 code

Code P2234 is for a shorted O2 sensor on bank 2 sensor 1 and the most common failure is the O2 sensor is damaged physically or oil soaked, causing an internal short on the sensor wires.

Need help with a P2234 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.

P2234
trouble codes
Check Engine Light

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

SCHEDULE P2234 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

3,484

Rating Summary
3,176
153
40
23
92
3,176
153
40
23
92

Richard

10 years of experience
415 reviews
Richard
10 years of experience
This is the second time I’ve had Richard work on my car. He always does an outstanding job and is quick, knowledgeable and professional. Highly recommended!!
2012 DODGE CHALLENGER - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Michael

13 years of experience
372 reviews
Michael
13 years of experience
Mike was an absolute professional when he arrived. He walked me thru the whole process of my repairs and also made good recommendations for preventive issues. His mechanical knowledge and good customer services was a breath of air and greatly appreciated :-)
2007 CHEVROLET AVALANCHE - CHECK ENGINE LIGHT IS ON INSPECTION - MARIETTA, GEORGIA

Rodrigo

10 years of experience
85 reviews
Rodrigo
10 years of experience
Rodrigo was exactly on time, very professional and friendly. He assessed my car, let me know the exact problem when a previous mechanic from a shop in my area was unable to. I felt he was very honest and sincere letting me know the level of urgency that I deal with the issue. Absolutely no pressure. I will absolutely use Rodrigo the next time I need anything to do with my car and will tell everyone about him. This is such a great service, I will never go to another mechanic again. It is so convenient. I couldn’t be happier. :)
2013 SMART FORTWO - CHECK ENGINE LIGHT IS ON - LAS VEGAS, NEVADA

Ricardo

8 years of experience
223 reviews
Ricardo
8 years of experience
Great service and was very helpful on what maintenance my vehicle needed and what to expect in the future. Would definitely recommend to anyone and will.
2004 MITSUBISHI LANCER - CHECK ENGINE LIGHT IS ON - LOS ANGELES, CALIFORNIA

More related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...

Related questions

Q: Q: cylinder misfire

There seems to be a variety of symptoms going on at the same time. Addressing the ticking issue, it could be your lifters, and it could also be your fuel injectors. This could be part of the problem when it...

Q: Engine code P0325.

Hello, p0325 is a code for a Knock Sensor Circuit Malfunction. There is either a sensor fault or the wiring for the sensor to the engine control unit is shorted or has an open circuit. The first thing to check...

Q: Bad Ignition/electrical issue - takes several cranks before it starts!

Hello there, you have a few different faults going on with your 2007 Chevrolet Impala. A vehicle should not have to crank long before it starts unless there is a fault. Given the codes you have listed there are a...

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