Hello dear community. I have a problem with my Volvo c70 from 2007, 2.4 Lieter engine with 140 hp (petrol). I have read out error memory and it comb the error ECM-4201/three-way catalyst (TWC) efficiency. Wrong signal. I also tried to exchange some components like the catalyst of Skandix, Lambdasonde front a Denso and a Redix, air mass meter of Stark without suction tube and a sealing kit for the intake manifold. I don’t know so slowly where I should go further maybe you can help me thank you.