P21A1
Cylinder 6 Air-Fuel Ratio Imbalance
P21A1 is an OBD-II diagnostic trouble code meaning: Cylinder 6 Air-Fuel Ratio Imbalance. Common causes: dirty or faulty injectors, air leak in intake manifold. Estimated repair cost: $17–89.
Symptoms
- Uneven engine operation
- Power reduction
- Increased fuel consumption
- Dips during acceleration
- Check Engine Light Is On
Causes
- Dirty or faulty injectors
- Air leak in intake manifold
- Problems with the oxygen sensor
- Ignition coil malfunction
- Low cylinder compression
How to Fix
- Check the condition of the fuel injectors
- Diagnose intake tract leaks
- Check the operation of oxygen sensors
- Test the ignition coil and spark plugs
- Measure the compression in the cylinder
Related codes
Error P21A1 by Vehicle Brand
FAQ
What does the P21A1 code mean?
P21A1 is an OBD-II diagnostic trouble code that indicates: Cylinder 6 Air-Fuel Ratio Imbalance
What causes a P21A1 error code?
The most common causes of P21A1 include: Dirty or faulty injectors; Air leak in intake manifold; Problems with the oxygen sensor; Ignition coil malfunction.
How do I fix a P21A1 diagnostic trouble code?
To fix P21A1: Check the condition of the fuel injectors. Diagnose intake tract leaks. Check the operation of oxygen sensors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21A1?
Yes, but get it checked soon
How much does it cost to fix P21A1?
The estimated repair cost for P21A1 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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