What's the matter with the warning light of the heavy truck engine flickering on and off?

The warning light of heavy truck engine is on because the engine oxygen sensor is out of order.

The solution is: If there is something wrong with the engine oxygen sensor, you should go to the garage to repair the oxygen sensor in time to solve the problem that the engine failure light is on.

In order to always control the air-fuel ratio of combustible mixture in the best state, ECU detects the oxygen concentration in exhaust gas through oxygen sensor and controls the fuel injection amount accordingly. If the oxygen sensor fails, the ECU does not receive the oxygen concentration signal, and the engine failure indicator will light up.

Extended data:

The fault light of heavy truck engine is described as follows:

The engine may knock when using gasoline below the specified label, or when there are problems such as excessive engine temperature and serious carbon deposition in the combustion chamber. ECU can sense the occurrence of knock through knock sensor and eliminate knock by delaying ignition time. However, if the knock exceeds the processing capacity of ECU, the engine fault indicator will light up because of engine knock.

The engine will also sense the air intake of the engine intake pipe through the air flow meter, and control the air-fuel ratio and adjust the fuel injection quantity accordingly. If there is something wrong with the air flow meter, the ECU will not receive the air flow signal, and the engine fault indicator will light up.

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