Hello, have the following problem on the Skoda Fabia 6y5 , 1.4L 16V 55KW, 8004 ACH, Motor BBY, Built 2006, 89000 KM, monitor probe according to Kat does not work. I have already replaced this with a Bosch, the error persists. I also made sure that the probe does not come into contact with copper paste. The Before Kat probe is Ok according to AU measurement. Fuel consumption is as always. Mixture is neither too fat nor too lean. The probe voltage on the two white cables of 12V is also due. Signalka bel black and grey have passage to the control unit. An error was now in it for the first time, LMM unplausieles signal! Where can the error lie? ECU possibly defective? Greeting Thomas