P0302: Cylinder 2 Misfire — Causes and Fixes
Key Takeaway
P0302 targets cylinder 2. Use the swap test to diagnose it quickly.
P0302 = Cylinder 2 Misfire
Same root causes as any single-cylinder misfire — spark plug, ignition coil, fuel injector, or compression.
Top Causes
| Component | Symptoms | Fix Cost |
|---|---|---|
| Spark plug | Worn, fouled, wrong gap | $20 – $40 |
| Ignition coil | Cracked, weak spark | $50 – $150 |
| Fuel injector | Clogged or leaking | $150 – $300 |
| Valve issue | Low compression on cyl 2 | $1,000+ |
| Wiring | Damaged connector | $50 – $200 |
The Swap Test
Move the coil from cylinder 2 to another cylinder. Clear the code. If the misfire follows the coil, replace it. Works for spark plugs too.
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