Skip the auto shop - Our mechanics make house calls

P0041 OBD-II Trouble Code: O2 Sensor Signals Swapped Bank 1 Sensor 2/ Bank 2 Sensor 2

check engine light logo

P0041 code definition

P0041 tells us the ECU has detected swapped sensor signals for oxygen sensor 2 between banks 1 and 2. This code may be associated with P0040.

What the P0041 code means

P0041 means that the engine control unit (ECU) is seeing the signals for oxygen sensor 2 has switched between the left and right banks. The bank 1 sensor 2 signal is swapped with bank 2 sensor 2 causing the ECU to trigger a Check Engine Light on the dash.

What causes the P0041 code?

P0041 has a few common causes:

  • Swapped connectors between oxygen sensor 2 left and right bank
  • May indicate ECU failure or error
  • Wiring damaged, open, or shorted
  • Swapped oxygen sensor wiring between banks

Generally this code is a result of oxygen sensor replacement or repair and the connectors have been swapped.

What are the symptoms of the P0041 code?

The first symptom of P0041 is the ECU reading improper signals for bank 1 and 2 sensor 2. This causes a Check Engine Light to be displayed including a possible flashing Check Engine Light. After the code is displayed the ECU may put the car into a limp mode to prevent damage to the vehicle. Drivability issues such as poor vehicle fuel economy, engine stalling, loss of engine power, and poor running may all occur once the code is enabled.

How does a mechanic diagnose the P0041 code?

There are a few simple steps that must be taken when diagnosing P0041:

  • A qualified technician will hook up a scan tool to the vehicle's OBD-II port to confirm P0041 is the code present.

  • The freeze frame data will be observed for P0041 to see what conditions, such as vehicle speed, operating temperature, engine speed, and operating time the code was detected in, so that these conditions can be recreated on a road test.

  • A road test will be performed with a scan tool installed in the OBD-II port to confirm an issue is present.

  • The technician will visually inspect the wiring on both bank 1 and 2 sensor 2 looking for damaged wiring, broken wiring, swapped connectors, or wiring shorted to ground or power.

  • If the wiring passes the visual test, a continuity test will be performed with a multimeter for instance to tell us that the wiring has no breaks or shorts. This is done to rule the wiring out.

  • It is possible that all of these tests will be passed. If this occurs, the technician will perform a diagnostic test of the car’s ECU. These tests are specific to car makes and the manufacture will provide all steps to test the ECU.

Common mistakes when diagnosing the P0041 code

In general, this code is caused by previous repairs to the vehicle. Overlooking swapped connectors and jumping straight to ECU problems will cause test results to be faulty. Following step-by-step procedures prevents overlooking simple issues.

How serious is the P0041 code?

Though uncommon, P0041 can indicate a serious issue with the vehicle that will prevent normal and safe driving until repairs are made. This code may put the vehicle into a limp mode which prevents damage to the engine and catalytic converters. Any vehicle that is in limp mode or is running poorly should be inspected by a qualified technician before normal operation.

What repairs can fix the P0041 code?

There are a few potential fixes:

  • Bank 1 sensor 2 and bank 2 sensor 2 wiring or connectors must be swapped
  • Repairing or replacing any open, shorted, or damaged wiring
  • Swapping wiring to the proper side
  • In extreme cases, the ECU may be replaced

Additional comments for consideration regarding the P0041 code

P0041 is not a code that is seen often. Most likely it is due to repairs performed and a Check Engine Light will be present shortly after the repairs.

Need help with a P0041 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
Icon-warranty_badge-02

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

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.

GET A QUOTE

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...
P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem What the P0121 code means P0121 is a generic OBD-II code which indicates that the Engine Control...
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....


Related questions

Q: Can a bad cam seal cause a p0041 code in a 2001 1.8t engine? There is oil in 2 of the spark plug holes, timing belt is good

Hi there - no, a leaking cam seal will not cause a P0041, but it will cause misfires from shorting between the plug and cylinder head because of the oil leak on the plugs and coil boots. A P0041 code...

Q: Car is reading trouble code PO136 01/01

Hi. There could be a couple of things going on here. There are multiple oxygen sensors on your car and sometimes what we think bank 1 is may not be and the wrong oxygen sensor is replaced giving us the...

Q: Ecu problem wanting to make sure

You need to have some of the codes like the first three diagnosed using the proper pinpoint tests until a problem is found. You may have an electrical harness short or a cut that is causing all the codes. Only...