P0303Severity: High
P0303 – Cylinder 3 Misfire
A misfire was detected in cylinder number 3.
What it means
The ECU detects a loss of combustion in cylinder 3. The problem is usually in that cylinder's ignition or fuel component.
Symptoms
- Vibration
- Loss of power
- Check-engine light
- Rough idle
Common causes
- Faulty spark plug (cyl 3)
- Faulty ignition coil
- Clogged/faulty injector
- Compression loss
- Vacuum leak
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Frequently asked questions
What does trouble code P0303 mean?
P0303 – Cylinder 3 Misfire. The ECU detects a loss of combustion in cylinder 3. The problem is usually in that cylinder's ignition or fuel component.
Can I drive with a P0303 code?
This code is high severity. Driving for long can damage the engine; have it checked as soon as possible.