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

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Cost of diagnosing the P2272 code

P2272 is a diagnostic trouble code (DTC) for "O2 Sensor Signal Stuck Lean Bank 2 Sensor 2". 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
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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.

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P2272

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Very nice friendly mechanic. Very helpful with with questions that I had. Offered good advice. He explained some of the problems to me and what should be the next to resolve it before spending unnecessary monies. This was my first time using him and will not be my last. I would recommend him to anyone. Especially women because he does not seem to take advantage of our knowledge of not knowing things about cars.
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