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P0302 P0xxx · 动力总成（P） 高严重度
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.
严重程度说明： 高——立即停车诊断，继续行驶有扩大损坏的风险
你会注意到的故障现象
- Rough idle
- Flashing MIL under load
- Poor acceleration
- Fuel in the oil with prolonged driving
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed ignition coil or plug on cylinder 2
- 2 Clogged or leaking injector
- 3 Low compression
- 4 Head gasket leaking between cylinders
如何排查
先做花钱最少、侵入最小的检查——大多数这类码不是零件问题。
- ✓ 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.
维修方案
- Replace the ignition components
- Service or replace the injector
- Head gasket repair if compression is low on adjacent cylinders
P0302 —— 常见问题
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.