Dear community, I am at the end with my Latin. Users of small Hyundai Atos (our second car) cause us a lot of trouble. Our problem is that he shows the MKL permanently when reading via OBD only the message p0301 and p0304 ignition oscillators are detected. We have then exchanged the following parts: – ignition coil, wire and candles – camshaft sensor – catalyst at the cracker and lower vehicle the complete exhaust system – oil and oil filter – idle control – both Lambdasonden However everything without E rfolg, the MKL always goes out for a short time and in the stationary gas again. There were also pipes checked for leaks -> no leaks available. I would also have suspected the air mass sensor but if I showed this removal it is only implausible to O2 sensor. So I assume that this is in order. In the cylinder 1 the candle is also a little damp if you let it run stand gas. Therefore I have now exchanged the injection nozzles with each other 1 with 2 and 3 with 4 but Error remains on the cylinder 1 and 4. Now I am a bit planless and hope you still have an idea. P.s. Cylinder pressure is 9 bar for all 4 cylinders.Data about the vehicle: – Year of construction 2002 – mileage 81 TKM – air conditioning – engine identification G4HC – 43 KW – 999 ccm Thanks for your help.