My car went for an mot on Saturday and everything was perfectly fine except the lambda readings. They were both reason too high? I had a full milltek system fitted last week with a precat decat and 200 cell sports cat. Just wondering why it would be failing and if there's any way around it? The lambda sensors themselves are new so I can't imagine it's a fault with them and there are no leaks in the exhaust anywhere so I'm stuck with what to do other than pay more for a dodgy mot lol