What are the reasons why a car suddenly cannot start?

1 Answers
MacBrandon
07/29/25 2:31pm
There are several reasons why a car suddenly cannot start: 1. Poor gasoline quality, which leads to incomplete combustion of the air-fuel mixture during engine operation. 2. A damaged oxygen sensor or a damaged/loose sensor connector can cause the air-fuel mixture to be too lean or too rich, leading to malfunctions. 3. A malfunction in the air flow sensor or its circuit will prevent the ECU from receiving the correct intake air signal, making it unable to control the fuel amount properly, resulting in a mixture that is too lean or too rich and causing the engine to fail to operate normally. 4. Carbon buildup on the spark plugs can cause poor engine performance, leading to difficulties in starting, unstable idling, poor acceleration, backfiring during sudden acceleration, excessive exhaust emissions, increased fuel consumption, and other abnormal phenomena.
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