What does it mean when the EPC light is on and the engine shakes in an Audi A5?

[VanPiper]

Audi A5's EPC light being on and engine shaking indicate there may be a fault within the electronic throttle system. Below are specific explanations regarding the EPC light: 1. EPC warning light: When the EPC warning light is illuminated, the vehicle cannot start or operate normally. The owner must arrange for towing to a repair shop for electronic fault diagnosis and repair. Since EPC system faults require professional diagnostic equipment, owners cannot perform repairs themselves. 2. Preventive measures to avoid EPC light activation: The vehicle should receive timely maintenance after reaching certain mileage to ensure optimal performance and eliminate EPC light activation caused by engine carbon buildup. The gasoline used should be the manufacturer's recommended grade, as using compatible fuel plays a significant role in protecting the engine and throttle body, effectively reducing carbon deposits and maximizing engine performance.