P2251 - OBD II Trouble Code

Our automotive experts have put together the following information about the P2251 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P2251 code.

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