It could literally be a dozen or more issues. No use trying to guess, you need to scan the cars ECU to read the fault codes which in 99% of cases tell you exactly what part is the issue.
Buy yourself a code reader like Carista or OBD11 and it will pay for itself the 1st time you use it. Otherwise, take it to a VW specialist mechanic to be diagnosed and fixed. Don't take it to the dealership unless you like being raped for your $$.
VW specialist mechanic in Wollongong
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