P11FD
O2 Low Reference Circuit Low Voltage (NOx Sensor 2)
P11FD is an OBD-II diagnostic trouble code meaning: O2 Low Reference Circuit Low Voltage (NOx Sensor 2). Common causes: nox 2 sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $56–167.
Symptoms
- Check Engine Light Is On
- Reduced engine power
- Increased fuel consumption
- Unstable engine idling
- Dips during acceleration
Causes
- NOx 2 sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Sensor power problems
- Engine ECU malfunction
How to Fix
- Check the integrity of the wiring to the NOx sensor 2
- Check connections and contacts in the sensor connector
- Measure resistance and voltage at the sensor
- Replace NOx 2 sensor if necessary
- Test the operation of the system after repair
Related codes
FAQ
What does the P11FD code mean?
P11FD is an OBD-II diagnostic trouble code that indicates: O2 Low Reference Circuit Low Voltage (NOx Sensor 2)
What causes a P11FD error code?
The most common causes of P11FD include: NOx 2 sensor malfunction; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Sensor power problems.
How do I fix a P11FD diagnostic trouble code?
To fix P11FD: Check the integrity of the wiring to the NOx sensor 2. Check connections and contacts in the sensor connector. Measure resistance and voltage at the sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P11FD?
Limited driving only, diagnose soon
How much does it cost to fix P11FD?
The estimated repair cost for P11FD is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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