P2256
O2 Sensor Negative Current Control Circuit High Bank 2 Sensor 1
P2256 is an OBD-II diagnostic trouble code meaning: O2 Sensor Negative Current Control Circuit High Bank 2 Sensor 1. Common causes: open or short circuit in the oxygen sensor circuit, bank 2 sensor 1 oxygen sensor malfunction. Estimated repair cost: $28–89.
Symptoms
- Check Engine light comes on
- Increased fuel consumption
- Unstable engine idling
- Reduced engine power
- Dips during acceleration
Causes
- Open or short circuit in the oxygen sensor circuit
- Bank 2 Sensor 1 Oxygen Sensor Malfunction
- Connector problems or contact corrosion
- Engine ECU malfunction
- Wiring harness damage
How to Fix
- Check the integrity of the sensor wiring and connectors
- Measure the resistance and voltage in the sensor circuit
- Check the operation of the Bank 2 Sensor 1 oxygen sensor
- If necessary, replace the oxygen sensor
- Check and reflash the ECU if necessary
Related codes
Error P2256 by Vehicle Brand
FAQ
What does the P2256 code mean?
P2256 is an OBD-II diagnostic trouble code that indicates: O2 Sensor Negative Current Control Circuit High Bank 2 Sensor 1
What causes a P2256 error code?
The most common causes of P2256 include: Open or short circuit in the oxygen sensor circuit; Bank 2 Sensor 1 Oxygen Sensor Malfunction; Connector problems or contact corrosion; Engine ECU malfunction.
How do I fix a P2256 diagnostic trouble code?
To fix P2256: Check the integrity of the sensor wiring and connectors. Measure the resistance and voltage in the sensor circuit. Check the operation of the Bank 2 Sensor 1 oxygen sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2256?
Yes, but get it checked soon
How much does it cost to fix P2256?
The estimated repair cost for P2256 is $28–89. Actual cost depends on your vehicle, location, and labor rates.
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