P2273 BMW Code - O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 2

The code P2273 indicates that the O2 sensor signal for Bank 2 Sensor 2 is biased or stuck rich, meaning the sensor is detecting an excessively high voltage, suggesting an overly rich air-fuel mixture.

Common symptoms include poor fuel economy, increased emissions, rough idling, and potential engine misfires, as well as the check engine light being illuminated.

Possible causes include a faulty O2 sensor, exhaust leaks, a malfunctioning fuel injector, a vacuum leak, or issues with the engine control module (ECM).

To diagnose the P2273 code, check for any exhaust leaks, inspect the wiring and connections to the O2 sensor, test the O2 sensor for proper operation, and review live data from the engine control module using a scan tool.

While you can technically drive your vehicle, doing so may result in poor performance and fuel efficiency, and it could potentially cause further damage, so it’s advisable to address the code promptly.

The recommended repair often involves replacing the faulty O2 sensor, fixing any exhaust or vacuum leaks, and ensuring that the fuel system is functioning correctly.

You can reset the check engine light by using an OBDII scanner to clear the trouble codes, or by disconnecting the vehicle's battery for a few minutes, although the latter may reset other systems as well.

Not necessarily; while a faulty O2 sensor is a common cause, it’s important to diagnose other potential issues like fuel system problems or exhaust leaks that could also trigger the code.

Repair costs can vary widely based on the underlying issue, but replacing an O2 sensor typically ranges from $100 to $300, while more complex repairs involving the fuel system or exhaust could be more expensive.