i just had my disco1 scanned and code p1193-p1178 came up. i searched and saw where it said one was amfr, and one was o2, wouldclogged cats cause the air flow restriction, Isaw where yall recomend fuel & air filter changed.i had my cats gutted cause they where rattling but i did notclear the codes after they where gutted,but it drovemore freely afterwards. its gettn new cats on it right now, and i dont want to ruin the new cats 1998 discovery 94,000