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.

In the EA211 the water pump and the thermostat are one plastic module, and the pump is driven not by the timing belt but by a separate toothed belt behind the exhaust camshaft. There are usually two problems with it: the plastic housing warps or cracks (slow coolant loss, a sweet smell, rising temperature), or the drive belt ages (a chirping noise, then an engine left with no cooling). The housing is particularly sensitive if oil reaches it: for example from a leaking crankcase ventilation. The module has to be replaced whole: dismantling it warps it in itself.

The two weak points of the cooling system are the radiator and the heater matrix. The latter is inside the cabin: if it leaks, you get a sweet antifreeze smell, the windscreen mists up greasily from inside, and damp stays under the passenger side carpet. The damp goes unnoticed for a long time under the floor covering. And replacing the heater matrix means stripping the dashboard.

The Caddy has leaf springs at the back, because it was designed to carry loads, and that is exactly the part that tires from the way it is used. The sign of a tired spring is that the back of the car sits down even unladen (the rear wheel "sinks" into the arch), and a dull clonking or knocking is audible from the rear over bumps. The spring mount and the trailing arm bushes make the same noise. On a heavily loaded fleet car it is effectively a wear item; and a tired rear suspension wears the tyre unevenly too.

The Caddy sliding door is opened many times a day, and the lower roller carries the weight of the door. That is what wears first: the door is hard to start moving, it grinds, it sticks halfway, and finally it "drops". The door gap visibly differs at the top and the bottom. If the mounting of the guide rail works loose, the door presses against the body, and a rub mark is left on the paint. If the roller is not replaced, the hinge and the bodywork are damaged too. On a version with a sliding door on both sides, check both.

The per cylinder ignition coil of these direct injection, turbocharged petrol engines fails. According to the Haynes service material this and similar simple electrical faults account for roughly eighty per cent of workshop visits.