Lexus uxEPC fault light is on

When the engine fault light of the Lexus ux is on, the following conditions may have occurred in the vehicle: 1. There is a carbon deposit problem in the engine power unit or the spark plug; 2. The quality of the fuel added; 3. The water temperature sensor malfunctioning issues, etc. No matter which of the above problems occurs, the fault indicator light will be lit. At this time, the driver should realize the diagnosis through the computer tester, and rely on the fault code to realize troubleshooting and maintenance.

Among them, it is worth noting that the water temperature sensor has failed. When the temperature is low, the resistance increases, and when the temperature is high, the resistance decreases, because the water temperature sensor has a built-in thermistor. When the engine water temperature is low, the water temperature information input to the water temperature sensor of the ECU will make the air-fuel ratio richer, thereby improving the stability of the engine work. If the water temperature sensor does not generate cold engine status information at this time, the air-fuel ratio will become lean, causing the engine to run abnormally. In the same way, send a cold engine message after warming up, the air-fuel ratio will become richer, and the engine will not work properly.