Had a bit of a scare last week and thought my turbo had gone. Diagnostics pointed to that as well. Luckily it was only a problem with two coil packs, which were knackered and the other two showed high resitstance on the meter. All 4 were replaced as were the spark plugs. Car seems to be running fine now but just waned to check if i Had been ripped off by the garage. I was charged £300 for 4 coil packs, 4 plugs, diagnostics and one hours labour. This was a local garage and not a Seat Stealer.