CEL has an alarm prompt
After the car is started for a period of time, the car self-test indicator light stays on
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Startup exception
Difficult to start or accompanied by obvious abnormal noise, it may be difficult to start, or even flame out.
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Power decreases and Fuel consumption increases
The power is insufficient during the driving process, and the same speed is slower; the same distance, the fuel consumption increases.
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Black Smoke
Black Smoke from car exhaust: car exhaust is darker than before;
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