Hi can anyway help DUF failed her MOT no CO and lambda readings. Taken her to a Renault specialist who says a cat will have to go on but I'm not confident this is going to resolve the lambda issues. Garage says the diagnostics are says the car computer is faulty but we believe that to be the gunner chip. Garage has checked ecu sensors and apparently they are working. After a cat the next step is to get a second hand ecu. I fear DUF is slowly being tamed or worse she will never get an mot? Can anyone suggest advice