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P0302 P0xxx · パワートレーン (P) 重大度高
Cylinder 2 Misfire Detected
Cylinder 2 is misfiring. The diagnostic logic is identical to P0301 — the cylinder number simply tells you where to start looking.
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
- Rough idle
- Flashing MIL under load
- Poor acceleration
- Fuel in the oil with prolonged driving
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 Failed ignition coil or plug on cylinder 2
- 2 Clogged or leaking injector
- 3 Low compression
- 4 Head gasket leaking between cylinders
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。
- ✓ Confirm with the cylinder-specific misfire counter.
- ✓ Swap coil and plug to another cylinder and re-read the counters.
- ✓ Check compression; if two adjacent cylinders are both low, suspect the head gasket between them.
- ✓ Inspect the injector spray pattern on a flow bench if ignition is ruled out.
修理の選択肢
- Replace the ignition components
- Service or replace the injector
- Head gasket repair if compression is low on adjacent cylinders
P0302 — よくあるご質問
Two adjacent cylinders low on compression — what does that mean? +
Almost always a head gasket that has failed between the two cylinders, not two independent faults.
Can bad fuel cause a single-cylinder misfire? +
Rarely. Contaminated fuel usually affects all cylinders; a single cylinder points to a hardware fault.