Skip the auto shop - Our mechanics make house calls

P2272 OBD-II Trouble Code: O2 Sensor Signal Stuck Lean Bank 2 Sensor 2

Check Engine Light

What the P2272 code means?

P2272 is an OBD-II generic code for the engine control module (ECM) detecting the O2 sensor for bank 2 sensor 2 after the catalytic convertor is stuck lean.

What causes the P2272 code?

  • The O2 sensor for bank 2 sensor 2 is stuck in the lean voltage output when tested and stayed lean for a certain amount of time during ECM testing.

  • The wiring or connector for the O2 sensor has corrosion in the connections causing excessive resistance.

  • The exhaust has a leak in front of the O2 sensor.

  • Possible shorted or crossed wires.

What are the symptoms of the P2272 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 open loop fuel control on most manufacturer vehicles.

  • The engine may have run lean to prevent catalyst damage.

How does a mechanic diagnose the P2272 code?

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

  • Checks the O2 sensor for damage to the sensor or wiring connections.

  • Checks the exhaust for any leaks before the sensor.

  • Tests the O2 sensor output when the engine is richened using propane.

  • Removes O2 sensor and inspects for damage to sensing element from a damaged catalyst.

Common mistakes when diagnosing the P2272 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

  • Not repairing any exhaust leaks in front of the sensor

How serious is the P2272 code?

Code P2272 is a code indicating the O2 sensor post catalyst on bank 2 is staying lean all the time. This is due to a defective sensor or an exhaust leak in front of the sensor in most cases. This will cause the vehicle to fail emission testing.

What repairs can fix the P2272 code?

Additional comments for consideration regarding the P2272 code

Code P2272 is caused most commonly from an internal failure of the circuit inside the O2 sensor. The other most common failure is from the exhaust flange leaking in front of the sensor. This introducing excessive amounts of oxygen into the exhaust and will cause the sensor to stay mostly lean all the time.

Need help with a P2272 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

P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222 code means The manufacturer specifies a range of acceptable voltage to be produced from the throttle position...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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,...

Related questions

Q: Total electric failure - 2003 Plymouth Aztec

The issue could be the battery. If it was connected wrong it may have worn it down and caused it to fail prematurely. If it was used, then there is even more reason to suspect that is the issue. Have...

Q: What type of oil is best for this car if I need to change oil? I have a 5 cylinder straight 2006 Xc90.

The use of the wrong type of oil can sometimes cause codes like these, but this is rare. There my be a malfunctioning variable valve solenoid on the vehicle which can be the solenoid itself, actuator on the camshaft or...

Q: No throttle response on 2012 dodge avenger

In the future, please include the motor size. Thanks. Your electronic throttle system consists of the throttle pedal assembly with an accelerator pedal position sensor, the throttle body which consist of a TPS (Throttle Position Sensor), throttle plate actuator,...