What happened after FAW-Volkswagen 20 17 sagitar replaced the accelerator, accelerator pedal and oxygen sensor?

EPC light is on. First, the throttle body is dirty and has carbon deposits. Clean the throttle. Second, the air intake system produces vacuum leakage. Check whether the vacuum hose is firmly connected and broken. At this time, the air flow rate and throttle opening detected by the engine through the air flowmeter have a theoretical value (how big the throttle is and how much air is taken in), which will cause errors. ...