What does the yellow light of Volvo xc90 engine mean?

The reason for the yellow light on Volvo xc90 engine is: 1. The throttle valve is too dirty, resulting in too rich mixture; 2. Excessive carbon deposition in the engine leads to unqualified exhaust emission; 3. Engine oxygen sensor failure.

The reason for the yellow light on Volvo xc90 engine is: 1. The throttle valve is too dirty, resulting in too rich mixture; 2. Excessive carbon deposition in the engine leads to unqualified exhaust emission; 3. Engine oxygen sensor failure.

Generally, the engine fault light is on for the following reasons: sensor problems, including water temperature, crankshaft position, air flow, intake air temperature, oxygen sensor, etc. When these sensors are damaged, the contact is poor or the signal is interrupted, the ECU of the automobile can't get the engine data accurately, which will lead to the engine fault light coming on. Followed by maintenance problems, oil quality problems, poor combustion of mixed gas and so on.

Improper engine maintenance is the most common cause of engine failure. We know that all vehicles have a certain maintenance cycle. If the owner fails to maintain them on time and has bad driving habits, it will increase the burden of engine operation. Finally, you can only remind you to care about your car through the fault light.

As for oil quality, the oil quality mentioned here includes fuel oil and engine oil. As we know, the full fuel of a car is generally labeled, and the engine oil is also semi-synthetic and fully synthetic. Manufacturers generally advise car owners which brand of fuel and which type of engine oil to use. If the owner doesn't add it as required, it will lead to long-term engine wear, so it won't be anyone's fault.

Poor combustion of mixed gas, engine spark plug failure, ignition coil failure, fuel pump failure, oil circuit blockage, etc. Will cause poor combustion of the mixture in the engine. The problem of engine carbon deposition or knocking caused by poor combustion of mixed gas will eventually be monitored by the engine oxygen sensor and reported to ECU, and the fault light will naturally light up as a warning.

Whatever the reason, it is recommended that the owner go to the repair shop for maintenance as soon as possible.

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