P221A
NOx Sensor 1/2 Correlation Bank 1
P221A is an OBD-II diagnostic trouble code meaning: NOx Sensor 1/2 Correlation Bank 1. Common causes: nox sensor 1 or 2 malfunction, damage to the sensor wiring harness. Estimated repair cost: $56–167.
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
- Problems with passing inspection due to emissions
Causes
- NOx sensor 1 or 2 malfunction
- Damage to the sensor wiring harness
- Problems with sensor connectors
- Engine control unit malfunction
- Software error in the control system
How to Fix
- Check fault codes in the ECU memory
- Inspect the connection and wiring harness of the NOx sensors
- Check the operation of NOx sensors using diagnostic equipment
- Replace faulty NOx sensor if necessary
- Update ECU software if required
Related codes
Error P221A by Vehicle Brand
FAQ
What does the P221A code mean?
P221A is an OBD-II diagnostic trouble code that indicates: NOx Sensor 1/2 Correlation Bank 1
What causes a P221A error code?
The most common causes of P221A include: NOx sensor 1 or 2 malfunction; Damage to the sensor wiring harness; Problems with sensor connectors; Engine control unit malfunction.
How do I fix a P221A diagnostic trouble code?
To fix P221A: Check fault codes in the ECU memory. Inspect the connection and wiring harness of the NOx sensors. Check the operation of NOx sensors using diagnostic equipment. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P221A?
Yes, but get it checked soon
How much does it cost to fix P221A?
The estimated repair cost for P221A is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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