What's the matter with the Accord engine fault light on and off?

Regarding the problem that the engine fault light is on, I can only help you analyze the cause of this fault because I have never seen the existing car. The main reason why the engine fault light is on is that there is too much carbon deposit in the throttle or engine, and the proportion of mixed gas is unbalanced after the oxygen sensor fails, so it is easy to cause the engine fault light to be on. If you drive at a low speed in the urban area for a long time, this phenomenon is easy to appear. It is possible that the insulation layer of high-voltage line is easy to break down after aging, which leads to the engine fault light. Because the control unit self-diagnosis system generally does not give fault code instructions to high-voltage lines, it is difficult to find similar problems when they occur. Traffic jams should also be related to excessive carbon deposition and leakage of high-voltage circuits. It is necessary to use a special diagnostic computer for special vehicles and cooperate with experienced maintenance personnel to conduct comprehensive inspection.

The problem that the fault light goes out after you use ethanol gasoline may be because the fuel ethanol has the advantages of high octane number, good antiknock performance and high oxygen content, which can effectively reduce automobile exhaust emissions, and ethanol gasoline has a good cleaning effect. Therefore, when you use ethanol gasoline, ethanol gasoline dissolves the precipitation and condensation of some fuel impurities in the automobile fuel tank and oil circuit system, dredges the oil circuit, and makes the working condition of the engine reach the normal standard. Therefore, the fault light goes out.

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