What this usually means
Jetta rough idle is often coil packs, plugs, injector faults, PCV leak or intake carbon. Start with fault codes, misfire counters and smoke test before replacing throttle body or ECU.
What to ask the workshop before approving repair
- • Show the diagnostic fault codes.
- • Show photo/video proof of the failed part.
- • Give an itemised quote for parts and labour.
- • Explain why cheaper common fixes were ruled out.
- • Use/confirm: ODIS
- • Use/confirm: VCDS
- • Use/confirm: Smoke tester
This is not a final diagnosis. It is a money-saving checklist before you go workshop.