P11BF
O2 Reference Voltage Circuit Low Voltage (NOx Sensor 2)
P11BF is an OBD-II diagnostic trouble code meaning: O2 Reference Voltage Circuit Low Voltage (NOx Sensor 2). Common causes: open or short circuit in the nox 2 sensor circuit, nox 2 sensor malfunction. Estimated repair cost: $56–167.
Symptoms
- Increased fuel consumption
- Reduced engine power
- Check Engine Light Is On
- Increased level of harmful emissions
Causes
- Open or short circuit in the NOx 2 sensor circuit
- NOx 2 sensor malfunction
- Problems with the engine control unit
- Corroded contacts or damaged wiring harness
How to Fix
- Check NOx 2 sensor circuit continuity
- Check the resistance and voltage at the sensor
- Replace NOx 2 sensor if necessary
- Check and, if necessary, replace the engine control unit
Related codes
FAQ
What does the P11BF code mean?
P11BF is an OBD-II diagnostic trouble code that indicates: O2 Reference Voltage Circuit Low Voltage (NOx Sensor 2)
What causes a P11BF error code?
The most common causes of P11BF include: Open or short circuit in the NOx 2 sensor circuit; NOx 2 sensor malfunction; Problems with the engine control unit; Corroded contacts or damaged wiring harness.
How do I fix a P11BF diagnostic trouble code?
To fix P11BF: Check NOx 2 sensor circuit continuity. Check the resistance and voltage at the sensor. Replace NOx 2 sensor if necessary. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P11BF?
Yes, but get it checked soon
How much does it cost to fix P11BF?
The estimated repair cost for P11BF is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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