Hello, After I went with Kurt scon on troubleshooting is now the absolute worm in it. So I start. Original error: MKL went from time to time and out again… FC turned off: 61 (tank ventilation valve voltage too low) For a long time what now looks exactly where the problem lies. blue plug pulled off from tank ventilation valve and looked what comes now. Again turned out: FC 61. (tank ventilation valve voltage too low) So still. K urt meant: Possible cable defective So I set myself up again today and saw if there was any voltage on the line at all. Voltage was on it: 12,44 Volt battery however had 12,84 Volt gallub i… definitely more than in the plug arrived. LM also works: 14.5 Volt in the stand gas. So I removed the whole ventilation valve and looked if it works if you give direct current on it… It worked when you go directly to the battery… opens and closes. I thought about the line. And I found out that if you give the plug directly mass, then the Ventiel also works properly. I also had the one sclauch off to see if it attracts air… Yes he did. So I opened the cable channel above and soldered a cable to the apparently defective mass cable of the tank ventilation valve, which goes directly to mass. Quite a great idea… because now the MKL is constantly glowing. Ohso and before I soldered all of it, h I looked out again ( what I think I did 25 times today) and he suddenly showed me the FC: 71,73,21 and 31 but 31 I heard, is normal. What’s going on ?? yesterday it was only FC 61 and now almost the whole package…. Would an explanation: that I sprayed the engine with a garden hose before working, so that it cools down faster or that I can pull off the plug from the tank ventilation valve. Because the engine was running just before. Hope i I’ll give up soon.