tring to get the emmisions down on this one it has failed the mot just on emissions Co little bit high 0.5-0.6% lambda little high 1.040-1.100 has aparantly had two new cats in the last two years so there must be an underlying fault engine runs and drives fine no misfires checked plugs ok comp check ok lambda checked ok also replaced with new no difference at all all other sensors all within parameters and functioning ok no cracks around lambda mounting no aparent air leaks