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P0201 P0xxx · 动力总成（P） 高严重度
Injector Circuit Malfunction — Cylinder 1
The ECU detects an electrical problem on the cylinder 1 injector driver circuit: open, short, or a coil that is out of specification.
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
- Hard misfire on cylinder 1
- Fuel smell from the exhaust
- Rough running
- Possible catalyst damage from 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 injector coil
- 2 Open or shorted injector wiring
- 3 Corroded injector connector
- 4 Failed ECU driver (rare)
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 the misfire follows the cylinder with a misfire counter, not just a feel.
- ✓ Measure injector resistance at the connector and compare with specification.
- ✓ Swap the injector with another cylinder; if the fault moves, the injector is bad.
- ✓ Use a noid light or scope the injector pulse to check the ECU is driving it.
维修方案
- Replace the faulty injector
- Repair the wiring or connector
- ECU repair if the driver stage is dead
P0201 —— 常见问题
Can I drive with a dead injector? +
No — raw fuel washes the cylinder and destroys the catalytic converter within a short distance.
Should I replace all injectors? +
If mileage is high, replacing the full set avoids doing the labour twice; at minimum have the whole set flow-tested and cleaned.