P2273 OBD-II Trouble Code: O2 Sensor Signal Stuck Rich Bank 2 Sensor 2

Check Engine Light

P2273 code definition

The P2273 diagnostic trouble code is an indication that the Bank 2 Sensor 2 oxygen (O2) sensor signal is stuck on rich.

Related Trouble Codes:

What the P2273 code means

The purpose of the oxygen (O2) sensor is to monitor the amount of oxygen that is present in the exhaust. The air-fuel ratio is very important. Too much fuel will allow carbon monoxide to be emitted into the atmosphere. Too much oxygen will allow hydrocarbons and nitrogen oxides to be emitted into the atmosphere. The oxygen sensor will send information regarding the air-fuel ratio to the powertrain control module through a voltage signal. If the voltage signal indicates that the air-fuel ratio does not fall within the predetermined range that has been set by the manufacturer, the P2273 diagnostic trouble code will be stored by the powertrain control module (PCM) and the Check Engine Light will come on.

What causes the P2273 code?

  • Faulty oxygen (O2) sensor
  • Oxygen (O2) sensor wires that are broken, shorted, frayed, disconnected, or corroded
  • Oxygen (O2) sensor connectors that are disconnected, damaged, or corroded
  • A blown oxygen (O2) sensor fuse
  • Engine vacuum leaks
  • Exhaust leaks
  • Intake manifold leaks
  • Incorrect fuel pressure
  • Faulty powertrain control module (PCM)

What are the symptoms of the P2273 code?

  • Increased fuel consumption
  • Black smoke coming out of tailpipe
  • Lean engine condition
  • Rich engine condition
  • Check Engine Light on

How does a mechanic diagnose the P2273 code?

  • Diagnostic trouble codes should be diagnosed in the order that they appear in the powertrain control module (PCM)

  • Using an OBD-II scanner to collect all trouble codes that have been stored by the powertrain control module (PCM) as well as freeze frame data

  • Inspecting oxygen (O2) sensor wiring for breaks, shorts, frays, disconnections, and corrosion

  • Repairing or replacing oxygen (O2) sensor wiring that is damaged

  • Inspecting oxygen sensor (O2) sensor connectors for loose connections, damage, and corrosion

  • Using the OBD-II scanner to clear all diagnostic trouble codes and completing a test drive to see if the P2273 code comes back.

  • If the P2273 trouble code does come back, use a scanner to observe the voltage signal of the upstream oxygen (O2) sensor located in front of the catalytic converter.

  • This voltage reading should show a constant variation between 100 millivolts and 900 millivolts.

  • Observes the voltage signal of the downstream oxygen (O2) sensor, located behind the catalytic converter.

  • This voltage reading should show a slow variation between 100 millivolts and 200 millivolts.

  • If the oxygen (O2) sensor voltage readings coincide with the above specifications, inspecting the engine vacuum lines for leaks. Repairing engine vacuum leaks as necessary.

  • Using the OBD-II scanner to clear all diagnostic trouble codes and completing a test drive to see if the P2273 code comes back.

  • If the P2273 trouble code does come back, inspecting the exhaust for leaks and repairing the exhaust leaks as necessary.

  • Using the OBD-II scanner to clear all diagnostic trouble codes and completing a test drive to see if the P2273 code comes back.

  • If the P2273 trouble code does come back, inspecting the intake manifold for leaks. Repairing leaks as necessary.

  • The oxygen (O2) sensor may be faulty and need to be replaced if the voltage readings do not coincide with the above specifications.

  • Using the OBD-II scanner to clear all diagnostic trouble codes and completing a test drive to see if the P2273 code comes back.

  • If the P2273 diagnostic trouble code does come back, there is a possibility that the powertrain control module (PCM) is faulty and needs to be repaired and reprogrammed. This is rare.

Common mistakes when diagnosing the P2273 code

Often, the mistake is made of replacing the wrong oxygen (O2) sensor. This particular code refers to the Bank 2 Sensor 2 oxygen (O2) sensor. A common mistake that is made when diagnosing this code is overlooking faulty wiring and/or connectors or neglecting to inspect for vacuum leaks.

How serious is the P2273 code?

A diagnostic trouble code is normally considered serious when it causes drivability issues or a change in performance. The P2273 diagnostic trouble code is not known to cause drivability issues or a change in vehicle performance. For this reason, this trouble code is not considered serious. However, the car will burn more gas and emit more pollutants so it should be addressed as soon as possible.

What repairs can fix the P2273 code?

Additional comments for consideration regarding the P2273 code

One of the most important things to remember is that vacuum leaks have been known to cause the P2273 diagnostic trouble code. Before making a determination that the oxygen (O2) sensor needs to be replaced, inspect the vacuum hoses and connections to make sure they are properly installed and that there are no vacuum leaks. Vacuum leaks are less expensive to fix than oxygen (O2) sensors and depending on the make and model of the vehicle replacing an oxygen (O2) sensor can be costly.

Need help with a P2273 code?

YourMechanic offers certified 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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