i have got a s2 rs turbo 1.9 zvh. its running all cosworth managment and parts which i got from jano at oddkids. .when he mapped it all for me it was brilliant,about 4 months ago,but something has gone down on it ,meaning its reads 11 on emission which is burning nearly all petrol where it should be 3 or 4.i have had a look under the bonnet but cannot see any air leaks and so on, what else could have gone wrong please. i live in coventry so before i take it to jano in essex again i would like to fix it myself before drivng down there again
cheers