P03B2
Cylinder 3 Combustion Performance
P03B2 is an OBD-II diagnostic trouble code meaning: Cylinder 3 Combustion Performance. Common causes: worn spark plug in cylinder 3, malfunction of ignition coil/high voltage wire. Estimated repair cost: $22–167.
Symptoms
- Unstable engine operation
- Vibration at idle and under load
- Power Loss
- Increased fuel consumption
- Possible misfire in cylinder 3
Causes
- Worn spark plug in cylinder 3
- Malfunction of ignition coil/high voltage wire
- Nozzle contamination/coking
- Low cylinder compression
- Uneven wear of piston rings
- Valve sealing problems
- Malfunction of the camshaft position sensor (for systems with VVT)
How to Fix
- Read all fault codes and stored freeze frame data
- Conduct a visual inspection of the ignition system elements in cylinder 3
- Measure the compression in the problem cylinder
- Check the condition of the spark plug
- Evaluate the operation of the fuel injector (balance test or ultrasonic cleaning)
- Test ignition coil/high voltage wire
- If necessary, replace faulty components
- Reset ECM adaptations after repair
Related codes
Error P03B2 by Vehicle Brand
FAQ
What does the P03B2 code mean?
P03B2 is an OBD-II diagnostic trouble code that indicates: Cylinder 3 Combustion Performance
What causes a P03B2 error code?
The most common causes of P03B2 include: Worn spark plug in cylinder 3; Malfunction of ignition coil/high voltage wire; Nozzle contamination/coking; Low cylinder compression.
How do I fix a P03B2 diagnostic trouble code?
To fix P03B2: Read all fault codes and stored freeze frame data. Conduct a visual inspection of the ignition system elements in cylinder 3. Measure the compression in the problem cylinder. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P03B2?
Limited driving only, diagnose soon
How much does it cost to fix P03B2?
The estimated repair cost for P03B2 is $22–167. Actual cost depends on your vehicle, location, and labor rates.
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