The brief
The Touran, a heavy family MPV, had developed a clunk from the front over bumps, the steering had gone vague, and the inside edges of the front tyres were wearing unevenly. Those are the signs of the front geometry no longer being held where it should be. The front subframe is the cradle that carries the engine and the front suspension, and it bolts to the body through rubber bushings that locate everything precisely. Over years and miles, on a car that carries weight, the bushings collapse and the subframe itself can corrode and lose its rigidity, so the whole front end moves around more than it's meant to. That movement is the clunk over bumps, the wandering steering, and uneven tyre wear because the wheels aren't sitting at the angles they're set to.
The diagnosis
On the lift a pry-test confirmed it: the front subframe bushings were collapsed past the service limit, the rubber breaking up, and the subframe was tired enough that replacing the whole assembly made more sense than just pressing in bushings. The lower arms and links were within tolerance. So the call was a subframe replacement, with a four-wheel alignment after to reset the geometry on the new parts, since dropping the subframe moves everything.
The work
The engine was supported, the front subframe dropped out, and a new genuine VW-spec subframe fitted with fresh bushings, the suspension and steering components transferred over and every fastener torqued to the manual figures with new bolts where called for. Then the car was rolled onto the alignment rig for a four-wheel set-up. A road test confirmed the clunk was gone and the steering had firmed back up.
The outcome
Clunk gone, the steering tight again, and the alignment back on spec, so the front tyres will wear evenly. The Touran went home tracking properly. The subframe carries the whole front end, and once it and its bushings are gone the handling drifts and the tyres pay for it, so a fresh subframe and a reset alignment put it all back where it belongs.