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P2251 - O2 Sensor Negative Current Control Circuit Open Bank 1 Sensor 1

Possible causes
- Faulty Front Oxygen Sensor Bank 1
- Front Oxygen Sensor Bank 1 harness is open or shorted
- Front Oxygen Sensor Bank 1 circuit poor electrical connection
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P2251 Description

The Front Oxygen Sensor (O2 Sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

P2251 Information for specific makes
P2251 ACURA Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 VS Line High Voltage
P2251 DODGE O2 Sensor Negative Current Control Circuit Open Bank 1 Sensor 1
P2251 FORD O2 Sensor Negative Current Control Circuit Open Bank 1 Sensor 1
P2251 HONDA Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 VS Line High Voltage
P2251 HYUNDAI O2 Sensor Negative Current Control Circuit Open Bank 1 Sensor 1
P2251 LEXUS Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 VS Line High Voltage
P2251 LINCOLN O2 Sensor Negative Current Control Circuit Open Bank 1 Sensor 1
P2251 MERCURY O2 Sensor Negative Current Control Circuit Open Bank 1 Sensor 1
P2251 SCION Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 VS Line High Voltage
P2251 TOYOTA Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 VS Line High Voltage
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