P2276 Fault Code

O2 Sensor Signal Stuck Lean Bank 2 Sensor 3

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

The P2276 fault code indicates that the O2 sensor signal for Bank 2 Sensor 3 is registering a lean condition, meaning that the air-fuel mixture is too lean for the engine's operation. This condition can lead to inefficient engine performance and can negatively affect fuel economy.

What are the symptoms of the P2276 code?

Drivers may experience several symptoms when this fault code is present, such as:

• Poor engine performance or rough idling.
• Decreased fuel efficiency.
• Illuminated check engine light on the dashboard.
• Possible failure of emissions tests due to high levels of pollutants.

What causes the P2276 code?

This issue can be caused by various factors, including:

• A malfunctioning oxygen sensor that fails to provide accurate readings.
• Vacuum leaks in the intake manifold or associated hoses.
• Fuel delivery problems, such as a clogged fuel filter or failing fuel pump.
• Exhaust leaks near the oxygen sensor, which can alter the sensor's readings.

How to fix P2276?

To resolve the P2276 fault code, the following steps can be taken:

• Inspect and replace the oxygen sensor if it is found to be defective.
• Check for any vacuum leaks in the engine and repair them as necessary.
• Ensure that the fuel system is functioning correctly, including the fuel pump and filters.
• Inspect the exhaust system for leaks near the sensor and repair as needed.