Why is the Volkswagen POLO“EPC "light on? I consulted the 4S shop on this issue and said that it is ok to clean the throttle, but it still doesn't work. What should we do?

Polo's EPC lighting problem is not a single problem, which may occur in the air intake system, the plug of the throttle valve is loose, and the wiring harness is worn. You can check it with the computer and check it according to the fault code. In particular, the fault code of "throttle fault" is generally caused by harness wear or poor local contact, so the inspection needs to be very careful.