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P0303 P0xxx · 动力总成（P） 高严重度
Cylinder 3 Misfire Detected
Cylinder 3 misfire. Same diagnostic approach as other cylinder-specific misfire codes: confirm the cylinder, then swap-test to move the fault.
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
- Vibration under load
- Flashing MIL
- Catalyst-damaging raw fuel
常见原因
按可能性从高到低排列——从最上面开始查。
- 1 Failed coil or plug
- 2 Faulty injector
- 3 Vacuum leak at the cylinder 3 runner
- 4 Low compression
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 per-cylinder misfire counters at idle and under load.
- ✓ Swap ignition components between cylinders 3 and 4.
- ✓ Smoke-test the intake manifold if the runner gasket is suspect.
- ✓ Compression and leak-down test if hardware is still suspect.
维修方案
- Replace the coil or plug
- Service the injector
- Repair the intake runner leak
- Mechanical repair if compression is low
P0303 —— 常见问题
Does the cylinder number follow the firing order? +
No — cylinder numbers are physical positions. Check the manual for the layout of your engine.
Can I keep driving briefly? +
A light misfire at idle only can wait a short time. A misfire under load is a stop-now condition.