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P0301 P0xxx · 动力总成（P） 高严重度
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.
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
- Shaking at idle
- Flashing check-engine light under load
- Fuel smell
- Loss of power
常见原因
按可能性从高到低排列——从最上面开始查。
- 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
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。
- ✓ 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.
维修方案
- Replace plugs and/or coil
- Replace or clean the injector
- Valve or piston repair if compression is low
P0301 —— 常见问题
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.