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

Possible causes
- Faulty Front Heated Oxygen Sensor Bank 1
- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated 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 heated oxygen sensor (or 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 Powertrain Control Module (PCM) monitors the universal heated oxygen sensor (HO2S) for a circuit concern. The P2251 sets when the PCM detects a concern with the circuit used to determine the oxygen content in the exhaust gas.

P2251 Information for specific makes
P2251 ACURA Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 VS Line High Voltage
P2251 DODGE Oxygen Sensor Negative Current Control Circuit Open - Bank 1 Sensor 1
P2251 FORD Oxygen 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 Reference Ground Circuit/Open Bank 1 Sensor 1
P2251 LEXUS Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 VS Line High Voltage
P2251 LINCOLN Oxygen Sensor Negative Current Control Circuit Open - Bank 1 Sensor 1
P2251 MERCURY Oxygen 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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