P2273 Fault Code

O2 Sensor Signal Stuck Rich Bank 2 Sensor 2

• What does that mean?
• Symptoms
• Causes
• Solutions

• The P2273 code indicates that the oxygen (O2) sensor signal for Bank 2, Sensor 2 is stuck in a rich condition. This suggests that the engine control module (ECM) is detecting an excessive amount of fuel in the exhaust.
• This is particularly relevant for vehicles with multiple banks of cylinders, where Bank 2 typically refers to the side opposite Bank 1.
• Sensor 2 usually refers to the O2 sensor located after the catalytic converter, which is responsible for monitoring the emissions from the engine exhaust.*

What are the symptoms of the P2273 code?

• Illuminated check engine light on the dashboard.
• Potential decrease in fuel efficiency due to an incorrect fuel mixture.
• Increased emissions leading to possible failure in emissions testing.
• Engine performance issues such as rough idling or stalling—though this can be variable.*

What causes the P2273 code?

• Faulty O2 sensor that may be providing erroneous readings.
• Exhaust leaks before the sensor that can lead to incorrect air-fuel ratio readings.
• Issues with the fuel delivery system, such as a leaking fuel injector.
• Problems with the engine management system, including software glitches or faulty wiring.*

How to fix P2273?

• Inspect and replace the faulty Bank 2, Sensor 2 O2 sensor if necessary.
• Check for and repair any exhaust leaks that may be impacting sensor readings.
• Test the fuel injection system for leaks and replace any malfunctioning injectors.
• Clear any fault codes after repairs and ensure that the vehicle runs within appropriate parameters during a test drive.*