What is the reason for the high exhaust temperature warning light?

[VanLogan]

It is likely due to the idle switch not closing. When the idle contact is disconnected, the ECU determines that the engine is under partial load. At this time, the ECU determines the fuel injection quantity and injection time based on the signals from the air flow sensor, crankshaft position, and engine speed. The exhaust temperature warning light in modern cars is higher due to the installation of a three-way catalytic converter. Here is additional information: Car indicator lights: The engine fault indicator light is labeled as CHECK ENGINE or MIL. It has two states and indications: one is a constant light, indicating that there is a fault in the engine's electronic control system; the other is a flashing light, indicating that the fault is still affecting some performance of the engine.