The EGR cooler cools the recirculated exhaust gas before it enters the intake again, and coolant flows through it while it does so. The temperature difference between the two sides is large, so the wall can crack or the gasket can let through, and then the coolant reaches the exhaust or the intake side. This leaves no puddle under the car and the place of the leak is not visible from outside: the coolant evaporates and the level drops slowly, over weeks. The accompanying signs are whitish smoke, a rising coolant temperature, raised pressure in the cooling system and a sweetish smell. If it goes on for months the cylinder head can be damaged too, because the cooling gradually gets worse. On the EA189 engines the fault code P2425 usually comes with it. The problem is reported above 100,000 km, and replacing the cooler costs 600 to 1,500 euro.

On these engines the oil pump is driven by its own small toothed belt, and that belt runs in the hot engine oil. This is not the large timing belt that drives the camshafts, it is a separate belt in the lower part of the engine. In the oil the rubber hardens over time, its surface starts to crumble, and the loose particles block the suction side of the oil pump, so the oil pressure drops. If the belt snaps, the oil pump stops at once and the engine is left without lubrication within seconds. The rubber crumbs can also ruin the turbocharger and the camshaft adjuster, because they are lubricated from the same oil circuit. The maker specifies no replacement interval for this belt, so most cars still carry the one fitted at the factory, and the failures are reported above 150,000 km. Oil outside the specification and a stretched oil change speed the process up, because this belt ages in the oil. Replacing the belt itself costs between 200 and 600 euro, as long as the engine has not run without oil pressure.

On short urban trips the particulate filter cannot burn through. The engine control unit then injects extra fuel late in the cycle to heat the filter, and part of that fuel passes down the cylinder wall into the sump. The oil level rises, the oil thins out, and it lubricates worse.

The light, magnesium cased MQ200 and the MQ250, sized for higher torque, are the most widespread manual gearboxes in the transverse engine VAG models. Both have the same two weak points, and both depend on use.

The internal springs of the flywheel tire, and the two discs knock against each other. The signs are a rattling or knocking from the bellhousing at idle and when releasing the clutch pedal, and vibration through the floor. If the clutch slips without a burnt smell, that also points to the flywheel. It is worth replacing in time: a disintegrated flywheel can destroy the bellhousing too. At a clutch replacement the two go together anyway.

On the EA288 the coolant pump is demand-controlled, and after replacement the cooling circuit cannot be filled the old way. The Schaeffler/INA repair specification requires the system to be filled with a vacuum device and bled with a diagnostic tool, following the vehicle manufacturer instructions.

At the factory the roof drain hoses were fixed to their stubs with only a few spots of adhesive; heat separates them over time, and the water runs onto the headlining. The drains are also narrow and block up easily. The sign is a damp headlining around the A-pillar, or water in the footwell. The maker issued a technical bulletin about it for the 2015 to 2017 Golf and GTI models.

After startup or while driving a loud clicking, clattering noise comes from behind the dashboard, typically for three to five seconds, at irregular intervals. The actuator motors that move the climate control blend flaps fail. Stripping the dashboard is seven to eight hours of work, so the labour makes up most of the bill.

On a longer straight stretch, typically above 100 km/h, a small steering correction first has to overcome a noticeable force, and then the steering responds suddenly, with a jolt. It is most obvious when holding a lane: the car does not follow your hand smoothly but "jumps". It does not come from wear but is a characteristic of the steering rack, and VW issued a service bulletin (TPI) about replacing it. Outside warranty the replacement is a major item, comparable to a significant share of the car's value on an older example.

A milky, sometimes fingerprint like coating or mist appears on the inside of the xenon headlight lens, and the light output drops noticeably. It affects cars built up to mid 2016. VW issued a service bulletin (TPI) about it with a limit sample description, and replaced the affected lights under warranty. Outside warranty the replacement is charged per headlight unit.

The touchscreen of the head unit does not respond to touch, typically in the cold; meanwhile the radio changes station on its own, and the climate and navigation controls are unusable. It affects the Composition Media and Discover Media units between 2013 and 2016. A software update sometimes resolves it; if not, replacing the display unit is a substantial item.