Hello dear community, I once looked for a topic like this, but I found none. I have a problem with my Twingo. Bj 2001 C06 has about 180000 on the clock and is the 1.2 liter machine with 58 hp. I supplied the good directly after purchase with fresh oil and filter and it ran impeccable. Then after half a year he started to run all of a sudden and was standing just ahead and jerking very much. Gas was also hardly possible due to air With Ach and Krach only 80 km/h. I then looked with an OBD plug once, whether errors are displayed. Missing. No error. However, with current measurement catalyst incomplete and o2 sensor incomplete. So I thought about the lambda probe, which I also changed directly. Unfortunately, wrong indication. It ran better, but it still jerks very much and the leis So I started to change everything at the ignition system. Spark plugs, ignition coil, ignition cable. No improvement. Then a friend recommended me to change the crankshaft sensor. Also I changed it. No change. A buffer comes out of the exhaust by the way. So irregularly and the engine sounds like there is a valve leaking somewhere. So I definitely have no idea what it might be. Does any of you have any idea? Thank you in advance and many greetings