P2272 B2S2 lean mixture O2 sensor signal stuck

OBD-II DTC Datasheet

O2 Sensor Signal Stuck Bank 2 Sensor 2

What does this mean?

This is a generic transmission code which means it covers all makes / models from 1996 onwards. However, specific troubleshooting steps may differ from vehicle to vehicle.

This DTC P2272 applies to the post-catalytic converter O2 (oxygen) sensor on block # 1, sensor # 2. This post-cat sensor is used to monitor the efficiency of the catalytic converter. The converter's job is to reduce exhaust emissions. This DTC sets when the PCM detects the signal from the O2 sensor as stuck lean or misaligned lean.

DTC P2272 refers to the downstream sensor (after the catalytic converter), sensor #2 on bank #2. Bank #2 is the side of the engine that does not have cylinder #1. There may be a third sensor on the output, if this is a problem, P2276 is set.

This code basically tells you that the signal emitted by a specific oxygen sensor is stuck in a lean mixture (which means there is too much air in the exhaust).

Note. Some manufacturers, such as Ford, may refer to this as the catalyst monitor sensor, the same thing but in a different way. This DTC is very similar to P2197. If you have multiple DTCs, fix them in the order they appear.

symptoms

Chances are you won't notice any handling issues as this is not sensor # 1. You will notice that the Malfunction Indicator Light (MIL) comes on. However, in some cases, the engine may run intermittently.

Possible reasons

Reasons for this DTC may include:

Exhaust gas leak near O2 sensor
Dirty or defective HO2S2 sensor (sensor 2)
HO2S2 Wiring / Circuit Problem
Free installation of the HO2S2 sensor
Incorrect fuel pressure
Defective fuel injector
Leaking engine coolant
Defective purge solenoid valve
PCM out of order

Diagnostic and repair procedures

Visually inspect wiring and connectors for corrosion, scuffed / abraded / kinked wires, bent / loose wire pins, burnt and / or crossed wires. Repair or replace as needed. It would be nice to visually check the wiring of all sensors.

Check for exhaust leaks and repair if necessary.

Using a digital voltmeter (DVOM) set to ohms, test the harness connector (s) for resistance. Compare with manufacturer specifications. Replace or repair as necessary.

If you have access to the advanced scan tool, use it to monitor the sensor reading as seen by the PCM (engine running at normal operating temperature in closed loop mode). Observe bank 2 sensor 2 readings. The rear heated oxygen sensor (HO2S) usually sees voltage fluctuations between 0 and 1 volt, for this DTC you will probably see the voltage "stuck" at 0 V. Rotation of the engine should cause a change (response) sensor voltage.

The most common fixes for this DTC are an exhaust air leak, a problem with the sensor / wiring wiring, or the sensor itself. If you are replacing your O2 sensor, buy an OEM (brand name) sensor for best results.

If you are removing the HO2S, check for contamination from fuel, engine oil, and coolant.

Other troubleshooting ideas: Use a fuel pressure tester, check the fuel pressure at the Schrader valve on the fuel rail. Compare with manufacturer's specification. Inspect the purge solenoid valve. Inspect the fuel injectors. Inspect the coolant passages for leaks.

There may be technical service bulletins (TSBs) specific to your make and model and referring to this DTC, contact your dealership's service department or online source to find any specific TSBs that apply to your vehicle.

Diagnostic video

Here is a video that pertains to the Ford O2 sensor circuit test. An example here is a 2005 Mercury Sable with a P2270 code (same DTC but for Bank 1 versus Bank 2), the procedure will be the same for other makes / models. We are not affiliated with the producer of this video:

Related DTC discussions

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Ford E250 2005 4.6L – P2272 P2112 P2107 и P0446Get crazy. I scanned different codes. The problem is that I am driving normally and the engine suddenly stops. I park, neutralize, turn off, start the engine, and run again. But not everything is smooth. It doesn't accelerate. I had a code coil f. I replaced. I had the code for the oxygen sensor bank ...

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