Good morning to everyone! I’ve had the problem since anyway and ever that constantly concerns the motor control lamp. After a star diagnosis and subsequent deletion of the error, this remains until indefinite time away. It comes only after 2 weeks or so again! Unfortunately regularly. Error according to stardiagnosis is a defective cat. How can such a thing work? Can one explain to me the functioning of a kat in connection with the lambda probes? otorumbau made on 5.5 liters with 354 hp. The car from which the engine comes (w215 AMG) will have had a different cat. Can it now work that it has something on it? Stupid is that I don’t have a pale shimmer of degrees where to start. I even have the impression that it runs better with switched motor control light! But can it also imagine me, jumps in there by chance a kind of emergency program then? Many undefined questions. I don’t know how that sparks If I understood how it works, I could help myself somehow. Now I depend on your competence!