If you do not have a VagCom scanner then majority of the possible issues will not show on the standard OBD style scanner. For example when I bought my last Audi A4 (same as VW), there was no engine light or codes. When I scanned it with my friends VagCom, 13 codes popped up. If you need to take the car somewhere that has experience for them to let you now, check out SoloMotorsports on Pleasantdale Rd.