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Diagnostic Trouble code P2272: Oxygen Sensor Biased Or Stuck Lean Signal
Written by
Osuagwu Solomon in
Mechanic Talk,
OBDII codes Last Updated December 19, 2022
Oxygen sensors play two significant roles in cars. They measure the amount of oxygen in the exhaust gas passing through the exhaust pipes and monitor the operating efficiency of the catalytic converter. They transmit these signals to the engine control module (ECM), which uses this information to fine-tune the optimal engine operation.
If the ECM receives data that falls outside the expected reading, it’ll log error codes
P2270, P2272,
P2271, or P2279, as the case may be. This article will discuss the meaning, key causes, probable symptoms, and how to rectify P2272 error codes.
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What does error code P2272 mean?
A P2272 Diagnostic trouble code means ‘oxygen sensor biased or stuck lean signal’ (bank 2, Sensor 2).
The O2 sensor in cars monitors what’s happening in the exhaust system and reports the information to the powertrain control module via a voltage signal. The
PCM understands what the O2 sensor is saying by the changes in voltage.
For instance, if the engine control unit receives 1000 millivolts every second from the oxygen sensor, it means there’s too much fuel vapor in the exhaust gas. On the other hand, if it receives 10 millivolts every second, it shows there’s too much air or too little fuel vapor in the exhaust gas.
The powertrain control module works with a baseline of 450 millivolts, nearly in the middle of low and high voltages. It, however, compares the readings with the expected reading stored in its memory to see if it can make necessary adjustments. It also looks at how long the O2 sensor has been sending the incorrect reading.
If the engine control module detects the reading from the O2 sensor bank 2 sensor 2 is too low compared to the expected reading, it’ll throw error code P2272 on Ford F150 or the respective car model.
What Causes error code P2272?
Several factors can cause a P2272 on Cadilac escalade and other car models. We’ll look at the most apparent causes.
Lousy oxygen sensor
The downstream oxygen sensor monitors the operating efficiency of the catalytic converter. It also helps measure oxygen and fuel vapor in the exhaust gas and reports the information to the engine control unit.
If the O2 sensor fails, it will send a false signal or may not even send any signal to the engine control module. A failed downstream sensor on bank 2 will cause the car computer to throw error code P2272 on Chevy Silverado or your respective car model.
Vacuum leaks
Another prominent cause of code P2270 and P2272 is vacuum leaks. Car engines have
MAF sensors that measure the amount of air entering the engine. This sensor reports its reading to the PCM for proper adjustment.
And if there’s a leak somewhere in the system and the mass airflow sensor does not notice it, the oxygen system will report this to the car computer. The computer will log a P2272 error code on its memory.
Fuel delivery issues
As reiterated above, a P2272 code on Chevy Silverado or your respective car model means there’s too much air or too little fuel vapor in the exhaust gas. This can emanate from a clogged fuel filter that’s restraining adequate fuel to the combustion chambers or from lousy fuel injectors. Other fuel delivery system components, like the
fuel pressure regulator, can be the culprit.
Exhaust leaks
The unmeasured air may not even come from the intake lines. It could mean you have exhaust leaks between the manifold and the muffler. Whether the exhaust leaks from the manifold, necks, or pipes, you need to rectify the probable causes.
Lousy car computer
A malfunctioning powertrain control module is an unlikely but possible cause of P2272 on Mercedes and other car models. The PCM receives readings from various
car sensors and works with the information to adjust system performance. If the PCM malfunctions, it can disregard the received data and make wrong adjustments.
