Ibiswhite_s3

I’ve got a s3 8p bhz engine got a few fault codes relating to the lambda sensor fault code p3255 fault code p3266 fault code p2237 also got a random misfire across all the cylinders. it had a new lambda sensor last October from a main dealer. the car is a stage 2 with 3” downpipe and decat. so only has the one lambda sensor in the downpipe. what’s my issue guys Any help would be great