right here we go. had the rangie now for 9 months love it to bits even tho it does keep u on ur toes.for the last 4 months its run like a sack o s**t in petrol reasonable on gas so took it back to gas man he ****ed about with it for 2 hours supposed to be a top notch gas installer( to b quite honest he knows as much about it as l do and its 15 years since i installed gas kits on cars) so l was at a freinds house who is a service manager at the local jag dealer he took one look under the bonnet and said if u stook ur head in the gas oven at 180 degrees could u breathe well no l said well how do u expect that to do the same . so took the k&n filter off fitted the correct filter housing and a new filter all flat spots gone on gas goes like a excercet missile. whist at work yesterday our fitter said ive just got a new engine diagnostic kit shall we try it on ur rangie wont work l said plugged it in hey presto 2 fault codes p1319 and p0134 which is no1 sensor on bank 1 cleared the faults monitored the live data on a road test came home 40 miles runs like a dream so going to fit a new sensor and wait. so dont knock all these cheap kits try it first.(sorry its along post)