obd2.help

P0302

Cylinder 2 Misfire Detected

Your engine's cylinder 2 is not firing properly. This means the fuel-air mixture in that cylinder is not igniting correctly, causing the engine to run rough and lose power.

Severity3/5 Moderate
Can I drive?⚠ With caution

You can drive short distances at low speeds, but prolonged driving risks catalytic converter damage and increased emissions.

DIY
$20–$200
Shop
$150–$600
Difficulty
intermediate

What It Means

The PCM has detected that cylinder 2 is misfiring based on crankshaft position sensor data showing irregular rotation. The misfire rate has exceeded the manufacturer's threshold for triggering a diagnostic trouble code. This can be caused by ignition, fuel delivery, or mechanical issues specific to cylinder 2.

Symptoms

Common Causes

1. Worn or fouled spark plug in cylinder 2Very Likely
2. Faulty ignition coil on cylinder 2Likely
3. Damaged or worn spark plug wire/bootLikely
4. Clogged or failing fuel injector on cylinder 2Possible
5. Vacuum leak near cylinder 2 intakePossible
6. Low compression in cylinder 2 (worn valve or piston ring)Unlikely

Related Codes

FAQ

Can a misfire damage my catalytic converter?

Yes. Unburned fuel from a misfiring cylinder enters the exhaust and can overheat and damage the catalytic converter if not addressed promptly.

Why is only cylinder 2 misfiring?

Single-cylinder misfires usually point to a component specific to that cylinder, such as its spark plug, ignition coil, or fuel injector.

Should I replace all spark plugs if only one is bad?

It is generally recommended to replace all spark plugs at the same time, as they wear at similar rates and replacing all ensures consistent performance.