The solenoids of the mechatronics unit wear out: slow or harsh shifting, then limp mode. A characteristic sign is the partial or complete loss of reverse. Wear of the clutch pack or the wrong spring force causes jerking and slipping. Because of the wet design it fails less often and at higher mileage than the dry DQ200, but when it does fail, it is expensive.

The Aisin automatic of the transverse engine VAG models locks the torque converter across a wide slip range, which gains on fuel consumption but loses on the life of the friction lining. The sign of wear is a vibration or "buzzing" felt at lock-up, and the lock-up cycling on and off.

A thin wall of the mechatronics valve body can crack, which causes a loss of pressure. The typical signs: jerking and harsh shifting from 1st to 2nd at low speed, a flashing PRNDS display, then a gear engagement fault, intermittently at first.

The water collector tray under the windscreen (where the wiper mechanism sits) blocks up with leaves and dust. The water cannot drain, it stands, and it runs into the cabin: typically into the front footwell, often on the passenger side.

Surface corrosion of the rear subframe is a known phenomenon on the Mk2, mostly on cars built before 2010; the late facelift cars from 2010 to 2013 have less rust. Alongside it the sill, the wheel arch lip and the windscreen frame are the typical hot spots.

The G62 sensor tells the engine control unit how hot the coolant is. If it is faulty, the control unit thinks a warm engine is cold, and runs it rich: hard warm or cold starting, a rough idle, markedly increased fuel consumption, and a dash temperature gauge that jumps around or never reaches its usual reading. The part is cheap and can be replaced in half an hour: the trouble is that many people do not recognise it and replace an injector or a lambda sensor instead. If the fault persists, the rich mixture can destroy the catalytic converter too.

From the late nineties to around 2006, petrol engines used a secondary air pump to blow fresh air into the exhaust on a cold start, so the catalytic converter reaches operating temperature faster. The impeller of the pump rusts or its bearing seizes, soot clogs the combination valve (N112), and the rubber hoses crack. The control unit then stores the `P0411` code. It barely affects driving, but the engine warning light is on, and the emissions test can fail because of it, and the roadworthiness test with it.

The dash shows "Error: Workshop! Only leave vehicle in position P" with an audible warning. The message appears in whatever language the car is set to, for example "Fehler: Werkstatt! Fahrzeug nur in Stellung P verlassen" in German.