Dear forum, my Ibiza SC (6J1) 1.2 has been jerking in the cold during idle, sometimes very strong. From about 1500 rpm it runs quiet again and in warm condition too. After a defect of the second ignition coil was displayed in the fault memory, all ignition coils and all spark plugs were replaced. The candle of the second cylinder was also really completely over. The fault memory is now empty, but the jerking is still there. This morning he even took after a ku the engine/gas control light went on again for a short time, followed by the tyre pressure and the ESP light. After switching off and starting again, he ran as usual again and the whole drive. The master in the workshop said that he would tap on the crankshaft or camshaft sensor, but could now only switch on suspicion. At Seat I was told that they could only guess and imagine that etw Is there any way that I could support or replace one of the conjectures (without swapping)? So, for example, by simulating certain driving situations? So, can I help finding a problem? Should I have to replace it: Where can I find the crankshaft sensor? Behind the gearbox, so that I can find a solution to the problem. This has to go down? Thank you for your help now