First some data: Lupo Rave, 1.0, MKB AUC, year of construction 7/2004, Km-Stand 81,000 . The topic is not new. On a short drive I noticed quite clearly that a cylinder had dropouts. Home error read out …. P0300 combustion dropouts detected, P0301 1. cylinder. As far as, so good. All ignition cables degraded and controlled. In the candle plugs found corrosion damage. The cable plug to the ignition transformer of the ignition cable of the 1st cylinder was covered with “green chip” thick. Ergo has d If you look more closely, the entire pin in the plug holder is evaporated. This was certainly caused by a faulty contact of the plug. This means that a new ignition cable set and a new ignition transformer are ordered. Ignition cables are already installed. Wait for the ignition transformer. I have taken three photos. Hope you can still see some things. Hang them only in the following after, since I still have to charge them on the PC. Only by chance I have the O xydation on the plug. I had to “light in” with the lamp. I have read here in the forum many times about the “failure” of the first cylinder with the AUC engine. Certainly there are different causes for this. But in some articles it was to be read that only after exchange of the ignition transformer the error was fixed. For me the question arose, how does it come to the “running” of a contact pencil ?. Think that there could be 3 main causes here: 1.) Is it due to the Zündtrafo construction ? 2.) The plug of the ignition cable is not pressed properly and this has therefore no proper contact and the high voltage concerned by spark overlay the rest. (main cause ? ) 3.) Or with an engine wash with a high pressure device water is pressed under the rubber cover which then leads first to contact difficulties and oxidation to the contacts and the rest is then done by the high voltage.Conclusion: Control fixed plug seat and with a possible engine wash d Greeting Hans At picture three you can see that the massive pen in the Zündtrafo is completely gone. The high voltage has “eated” him.