The high pressure fuel pump is driven by the camshaft through a cam follower. The early version got a flat follower (the `BAG` is the most affected), and it can wear through from as little as 60,000 km; if it holes, the camshaft lobe is damaged too, and the repair jumps to many times the cost. The later `BLF` got a roller follower, where it is rarer. Symptoms are hesitation, loss of power, hard starting, and a low fuel pressure fault code.

With direct injection the fuel does not wash the intake valves: the petrol goes into the cylinder, not behind the valve. The oil mist and soot arriving through the EGR and the crankcase ventilation therefore build up on the valve stem and head, and from 80,000 to 100,000 km they restrict the flow. Symptoms are hesitation, loss of power, a rough cold start and misfire. It is not a part failure: it is a consequence of the design, and therefore it comes back. Cleaning (walnut or dry ice blasting) helps for a few tens of thousands of kilometres.

The ABS control unit fails. First the ABS and ESP lights come on intermittently, then they stay on, and the stability control drops out. The fault typically appears with code `01435`: that points at the controller of the hydraulic brake unit. The unit can often be refurbished, because the fault is in the soldering. A new controller is not always needed.

The first series Touran fails the roadworthiness test for rust more often than average, and the reports single out the tailgate. The corrosion starts along the edge and the seams, initially only as blistering paint. Added to that, oil leaks are above average on every model year and engine version, which contaminates the metal from below.

The rubber seals of the rear doors age and become porous, and the sunroof drains block up. The water gets into the rear footwell and the side wall of the boot; it stays under the carpet, so it goes unnoticed for a long time. The rear is full of electronics and trim, and the connectors corrode.