The AYC (active yaw control) light on an Evo 4 indicates a problem with the car's active yaw control system. The AYC system is designed to help the car maintain stability when cornering by applying brake pressure to the inside rear wheel. If the AYC light comes on, it means that the system is not working properly and the car may be more prone to oversteer.
There are a few things that could cause the AYC light to come on, including:
* Faulty AYC pump
* Faulty AYC solenoid
* Leaking AYC fluid
* Wiring issues
If the AYC light comes on, it is important to have the car inspected by a qualified mechanic as soon as possible.
