Check-engine light: solid, flashing and OBD basics
发动机故障灯：常亮、闪烁与 OBD 基础判断
Use the warning behaviour to decide whether to stop now or arrange diagnosis soon.
根据故障灯状态判断是立即停车，还是尽快安排检查。
Beginner diagnosis · 5–15 min · Owner manual; optional reputable OBD reader
1. Flashing means stop
A flashing check-engine light often indicates a severe misfire that can damage the catalytic converter. Reduce load, stop safely and arrange recovery.
闪烁时停车
发动机故障灯闪烁通常表示严重失火，可能损坏三元催化器；降低负荷、安全停车并安排救援。
2. Solid light needs timely diagnosis
If the car runs normally and the manual allows continued driving, tighten the fuel cap after refuelling and arrange a scan soon. Do not ignore it for weeks.
常亮需要尽快检查
若车辆运行正常且手册允许继续行驶，可确认加油盖已拧紧，并尽快读取故障码；不要长期忽视。
3. Read codes without guessing parts
An OBD code identifies a detected circuit or condition, not automatically a failed part. Record the exact code and freeze-frame data; do not erase it before diagnosis.
读取报码但不要盲目换件
OBD 故障码表示检测到的回路或状态，不等于某个零件一定损坏；记录完整代码和冻结帧，诊断前不要清码。
4. Stop for combined warnings
Stop and tow if the light appears with oil pressure, overheating, brake warning, severe shaking, smoke, fuel smell or major power loss.
组合警告时停止
若同时出现机油压力、水温、制动警告、严重抖动、烟雾、燃油味或明显动力下降，应停车拖车。