P0303 — Cylinder 3 Misfire Detected
| Meaning | The engine computer has detected that the third cylinder is not firing properly. This means the fuel inside that specific cylinder is not burning completely, causing the engine to run rough and lose power. |
| Family | Powertrain (P) |
Typical symptoms
The car hesitates or jerks when you press the gas pedal
The Check Engine light is flashing while driving
Common causes
Faulty ignition coil pack for cylinder 3
A failing fuel injector on cylinder 3
Low compression or internal engine wear in cylinder 3
What to do
Frequently asked questions
What does code P0303 mean?
Cylinder 3 Misfire Detected. The engine computer has detected that the third cylinder is not firing properly. This means the fuel inside that specific cylinder is not burning completely, causing the engine to run rough and lose power.
Can I keep driving with code P0303 active?
With caution: limp mode possible, have it checked soon
Common causes — P0303
Worn out or fouled spark plug on cylinder 3 Faulty ignition coil pack for cylinder 3 A failing fuel injector on cylinder 3 Low compression or internal engine wear in cylinder 3
How do you fix code P0303?
You should check the spark plug and ignition coil on cylinder 3 first, as these are the most common culprits. Address this issue promptly, especially if the check engine light is flashing, to avoid damaging the catalytic converter.
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Contact usRelated codes
- P0300 — Random/multiple cylinder misfire
- P0301 — Cylinder 1 misfire
- P0302 — Cylinder 2 Misfire Detected
- P0304 — Cylinder 4 Misfire Detected
- P0305 — Cylinder 5 Misfire Detected
- P0306 — Cylinder 6 Misfire Detected
- P0307 — Cylinder 7 Misfire Detected
- P0308 — Cylinder 8 Misfire Detected
- P0309 — Cylinder 9 Misfire Detected
- P0310 — Cylinder 10 Misfire Detected
- P0311 — Cylinder 11 Misfire Detected
- P0312 — Cylinder 12 Misfire Detected