P2273 Code: O2 Sensor Signal Biased/ Stuck Rich Bank 2 Sensor 2

Your vehicle is equipped with multiple sensors that work together to keep your engine running. Oxygen sensors, for example, are critical to keeping your engine’s air/fuel mixture at optimal levels. They communicate the amount of oxygen in the exhaust stream to the powertrain control module (PCM). These sensors also measure the efficiency of your ride’s catalytic converter.

P2273 is a generic trouble code that indicates a possible problem with the oxygen sensor’s signal. Read on to learn more about it.

What Does the P2273 Code Mean?

Diagnostic trouble code P2273 stands for “O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 2.”  The error code refers to the post-catalytic converter O2 (oxygen) sensor on bank #2, sensor #2.  Bank #2 is the side of the engine that does not house cylinder # 1.

Code P2273 is set once the signal that’s sent by the oxygen sensor is stuck rich. This usually means that there’s inadequate air in the exhaust.

The oxygen sensor signal is designed to fluctuate within a given voltage range. If the engine’s control module (PCM) does not detect the right fluctuations, it’ll also trigger the P2273 code.

Note: The definition of code P2273 can differ according to the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.

What Are the Possible Causes of the P2273 Code?

• Rich running condition caused by a leaking injector, faulty mass air flow sensor, etc.
• Bad oxygen sensor
• PCM malfunction
• Wiring problems

What Are the Possible Symptoms of the P2273 Code?

• Illuminated check engine light
• Noticeable decrease in engine performance
• Decreased fuel economy

How to Diagnose the P2273 Code

DTC P2773 can occur in a wide range of vehicles. This does not, however, imply that there is a one-size-fits-all answer to this problem.

Oxygen sensor diagnosis and repair necessitate advanced auto repair knowledge and expertise. In most circumstances, taking your vehicle to a trained mechanic will result in an accurate diagnosis.

Here’s a video of what the diagnostic procedure for this code might involve:

How to Fix the P2273 Code

The procedure for clearing a P2273 code varies based on the year, make, and model of the vehicle. Before performing any repairs, it’s critical to get vehicle-specific repair information.

You can either hire a professional or try to handle the repairs yourself. Whatever route you take, we recommend brushing up on your auto repair expertise by checking your vehicle’s repair manual or referring to an online repair database for vehicle-specific information.