Skip the auto shop - Our mechanics make house calls

P2254 OBD-II Trouble Code: O2 Sensor Negative Current Control Circuit/Open Bank 2 Sensor 1

Check Engine Light

P2254 code definition

O2 sensor negative current control circuit/open bank 2 sensor 1

What the P2254 code means

This trouble code indicates that the powertrain control module has detected a reference voltage from the O2 sensor that is upstream on the second bank of the exhaust that is not within the range of acceptance set by the vehicle’s manufacturer.

What are the causes of the P2254 code?

Some of the potential causes of this trouble code may include:

  • The upstream oxygen sensor on the second bank of exhaust could be faulty
  • The wiring or connectors that are associated with the oxygen sensor may be faulty
  • The fuel pressure could be out of specification and may contribute to this issue
  • The engine may have a vacuum leak somewhere that could also be a contributing factor
  • The powertrain control module could be malfunctioning

What are the symptoms of the P2254 code?

Some of the symptoms of this trouble code that the driver may experience would include:

  • The engine may run rich or lean depending on the direction of variation in the reference voltage (up or down).

  • The fuel economy of the vehicle may be decreased.

  • The Check Engine Light will likely be illuminated.

How does a mechanic diagnose the P2254 code?

A mechanic may diagnose this trouble code by first getting under the vehicle and inspecting the oxygen sensors for damage. This would also include checking the wiring and connectors that are associated with the oxygen sensor for damage as well. If no damage to the sensor or its circuitry are found, the mechanic would then test the sensor with a digital multimeter using the manufacturer’s recommended procedure. If the oxygen sensor tests good, the mechanic would then do a fuel pressure test and a vacuum test to determine whether or not these numbers are within specification. If these numbers are within specification, the powertrain control module would be tested with a high tech scan tool for proper function. If any issues arise during the diagnosis of this issue, they should be resolved before any further diagnosis takes place.

Common mistakes when diagnosing the P2254 code

A common mistake that could be made when diagnosing this trouble code would be to replace the oxygen sensor without doing any proper testing. Although the oxygen sensor failure is one of the most common causes of this trouble code, it is not the only cause. Therefore, the entire diagnostic procedure should be carried out in order to prevent a misdiagnosis as well as wasted time and money.

How serious is the P2254 code?

This trouble code would rank somewhere in the middle of the seriousness scale. Although no major driveability issues will occur, this trouble code can decrease the gas mileage of any vehicle that has it stored. With this being considered it would be wise to have the issue diagnosed and repaired at the earliest possible opportunity.

What repairs can fix the P2254 code?

Repairs that can potentially resolve the issues that are caused by this trouble code may include:

  • Replacing the oxygen sensor that is upstream on the second bank of exhaust

  • Repairing or replacing the wiring or connectors that are associated with the oxygen sensor

  • Resolving a fuel pressure issue

  • Repairing a vacuum leak

  • Replacing the powertrain control module

Additional comments regarding the P2254 code

It is possible that other codes related to the upstream oxygen sensor on bank 2 may be stored in addition to this trouble code. If this is the case, it is more likely that the oxygen sensor has failed. All relevant diagnostic procedures should still be carried out in the event that other codes exist.

Need help with a P2254 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

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


Post a question and get free advice from our certified mechanics.


More related articles

How Long Does a Throttle Return Spring Last?
Not all vehicles on the road feature an electronic throttle control (ETC), which is also called drive-by-wire. For vehicles that don't offer this system, they have a throttle cable instead that...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....

Related questions

Q: The Aveo starts to kick when i start to accelerate at 2000rpms and its everytime

When you say your car kicks, I think of a misfire in the engine under load. If you are getting a misfire, then a trouble code for the cylinder would be set. You should scan the computer and identify...

Q: My car starts but only runs for 3 seconds before it shuts down

Hello - Is your Check Engine Light on? If so, you can check the trouble codes yourself to diagnose the problem, or you can have a mobile technician, such as one from YourMechanic, come by at your convenience and diagnose...

Q: Trouble code P2432 - 2007 Lexus GX470

Hi - the P2432 code is an indication of low pressure from the pressure sensor. This pump is electric and may be worn out or simply needs the bearings oiled or replaced (if that is possible) - in either event,...