That is the engine and exhaust system fault light. There are many possible reasons, which can be roughly divided into the following three categories:
1. False fault. If a fault code is reported but the operation is normal, it may be that a certain operation is beyond the control range of the computer. The fault code fed back by the computer can be eliminated first and then see if the fault code still jumps.
2. Minor glitches. There is no particularly obvious fault in the engine. According to the computer detection information and further inspection, it is found that there is indeed some kind of fault, which does not affect normal driving or has a very small impact. It needs to be discovered and solved in time. For example, the intake air pressure sensor is faulty, etc.
3. Major failure. Such faults can be felt with the naked eye and driving experience, and seriously affect the normal operation of the engine, requiring immediate repair. For example, if the engine obviously lacks power, it may be an oxygen sensor problem.
You can check the front and rear oxygen sensors first. If this thing is broken, the initial symptom is that the engine fault light is always on (or flashes occasionally) in the instrument, but the car can still drive barely for a short time;
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If it is not repaired for a long time, the computer (ECU) of the electronic fuel injection system will not be able to obtain information about the oxygen concentration in the exhaust pipe, so it will not be able to perform feedback control of the air-fuel ratio, which will increase engine fuel consumption and exhaust pollution. , the engine experiences problems such as unstable idle speed, misfire, surge, etc. Therefore, faults must be eliminated or replaced in a timely manner.
Generally, current cars have two oxygen sensors, front and rear, one at the front and one at the rear of the three-way catalytic converter. The faulty one must be found and replaced in time. Failures of this product often occur when gasoline of different brands and types from different regions (ethanol gasoline, etc.) are mixed, or fuel treasure is added.
If this is the problem, hurry up and don’t delay. You can find out by plugging the computer into the 4S and measuring the exhaust gas flow data feedback.