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P0301 P0xxx · パワートレーン (P) 重大度高
Cylinder 1 Misfire Detected
Cylinder 1 is not contributing power consistently. Unlike a random misfire, this is isolated to one cylinder — so swap-testing parts will find it fast.
重大度の目安： 高 — 走行を止めてすぐに診断してください。さらに損傷が広がる恐れがあります
確認できる症状
- Shaking at idle
- Flashing check-engine light under load
- Fuel smell
- Loss of power
主な原因
可能性の高い順に並んでいます。上から順に確認してください。
- 1 Worn or fouled spark plug
- 2 Failed ignition coil
- 3 Faulty injector
- 4 Low compression from a burnt valve or worn rings
- 5 Intake leak at that cylinder's runner
点検・修理の手順
費用が安く侵襲の小さい項目から — これらのコードの大半は部品の問題ではありません。
- ✓ Read the misfire counter per cylinder to confirm it really is cylinder 1 and not a general misfire.
- ✓ Swap the coil and plug with another cylinder — if the misfire moves, you have your answer.
- ✓ Swap the injector next if ignition parts test good.
- ✓ Run a compression and leak-down test if the misfire stays on cylinder 1.
修理の選択肢
- Replace plugs and/or coil
- Replace or clean the injector
- Valve or piston repair if compression is low
P0301 — よくあるご質問
Why does the light flash? +
A flashing MIL means catalyst-damaging misfire. Stop and fix it — do not drive through it.
Is it always the coil? +
No. Work through ignition → fuel → compression; guessing costs more than testing.