P0302
Moderate severityCylinder 2 Misfire Detected
You can drive short distances, but fix it soon — a persistent misfire dumps unburned fuel into the exhaust and can damage your catalytic converter. If your check engine light is flashing, stop driving.
What does the P0302 code mean?
The P0302 code means cylinder 2 specifically is misfiring — it is not firing (burning fuel) the way it should. Because the code names the exact cylinder, diagnosis is easier: you know precisely where to look.
A misfire usually comes down to one of three things at that cylinder: spark (plug or coil), fuel (injector), or compression. If several cylinders misfire at once, you may also see P0300.
Can you keep driving with a P0302 code?
Yes, for short distances — but don’t ignore it. A steady misfire can overheat and ruin the catalytic converter, and the car may run rough or lose power. Get it fixed soon. If the check engine light is flashing, the misfire is active and damaging; pull over and stop driving.
What causes a P0302 code?
- Worn or fouled spark plug (cylinder 2)~35%
- Failing ignition coil (cylinder 2)~30%
- Vacuum leak or low compression~20%
- Clogged or leaking fuel injector (cylinder 2)~15%
How to diagnose a P0302 (check these first)
- Inspect the spark plug for cylinder 2 — cheap and often the culprit.
- Swap the ignition coil with a neighboring cylinder. If the misfire follows the coil, you found it.
- Check the fuel injector for cylinder 2.
- If it persists, do a compression test to rule out a mechanical issue.
P0302 repair cost
Typical US ranges including parts and labor (varies by vehicle):
| Spark plug | $10 – $60 |
| Ignition coil | $100 – $350 |
| Fuel injector | $150 – $500 |
Tools & parts that help
A $20 OBD-II scanner confirms the exact cylinder and any related codes before you buy parts. A coil and plug for one cylinder are inexpensive fixes.
See spark plugs & ignition coils ›P0302 — Frequently asked questions
Is it safe to drive with a P0302 code?
For short distances, yes, but fix it soon. If the check engine light is flashing, stop driving – an active misfire can destroy the catalytic converter.
How do I know if it’s the coil or the spark plug?
Swap the ignition coil to a different cylinder. If the misfire code follows the coil to the new cylinder, the coil is bad; if it stays, suspect the plug.
What’s the difference between P0300 and P0302?
P0300 is a random or multiple-cylinder misfire, while P030{num} points to one specific cylinder (number {num}).
How much does it cost to fix a P0302?
Often $10-$60 for a spark plug or $100-$350 for an ignition coil, depending on your vehicle.
Related codes
General guidance based on the standard definition of the P0302 code. A real diagnosis depends on your make, model, mileage and other symptoms. When in doubt, have a professional confirm the cause before replacing expensive parts.