P21AF
Reductant Level Sensor C Circuit Low
P21AF is an OBD-II diagnostic trouble code meaning: Reductant Level Sensor C Circuit Low. Common causes: faulty reductant level sensor c, open or short circuit in the sensor circuit. Estimated repair cost: $33–89.
Symptoms
- Check Engine light comes on
- Increased emissions of harmful substances
- Possible engine power limitation
- Incorrect reductant level readings
- Error message in the SCR system
Causes
- Faulty reductant level sensor C
- Open or short circuit in the sensor circuit
- Poor connection or corrosion in connectors
- Problems with the engine control unit (ECU)
- Low level of reductant in the tank
How to Fix
- Check the reductant level in the tank
- Inspect the sensor wiring and connectors for damage
- Check sensor resistance and voltage to specifications
- Replace the faulty reductant level sensor if necessary
- Reset the error code and check if it returns
Related codes
Error P21AF by Vehicle Brand
FAQ
What does the P21AF code mean?
P21AF is an OBD-II diagnostic trouble code that indicates: Reductant Level Sensor C Circuit Low
What causes a P21AF error code?
The most common causes of P21AF include: Faulty reductant level sensor C; Open or short circuit in the sensor circuit; Poor connection or corrosion in connectors; Problems with the engine control unit (ECU).
How do I fix a P21AF diagnostic trouble code?
To fix P21AF: Check the reductant level in the tank. Inspect the sensor wiring and connectors for damage. Check sensor resistance and voltage to specifications. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21AF?
Yes, but get it checked soon
How much does it cost to fix P21AF?
The estimated repair cost for P21AF is $33–89. Actual cost depends on your vehicle, location, and labor rates.
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