2008 Chevrolet Colorado 2wd-extended-cab OBD2 Code P2251 O2 Sensor Negative Current Control Circuit/Open

What Does P2251 Code Mean?

OBD-II Code P2251 is defined as a O2 Sensor Negative Current Control Circuit/Open

The purpose of the oxygen sensor is to measure the oxygen content in the exhaust gases after they leave the combustion process of the engine. This information is critical to the PCM's ability to maintain efficient fuel economy. When the PCM detects a failure of the sensor or the information received from the sensor, it will set code P2251.

P2251 Symptoms

• Decreased engine performance
• Increased fuel consumption

Common Problems That Trigger the P2251 Code

• Exhaust leak
• Oxygen sensor failure
• Powertrain Control Module (PCM) failure
• Wiring issue

Common Repairs Needed for the P2251 Code

• Oxygen Sensor Replacement