no i dont think so,i have had the same problem,i got a new cat fitted,they did reset the engine management light,but it came back on twice ,the garage reset it again but 4 weeks later the light has just came back on,i have a diagnostic reader and it still comes up with the code 420 referring to the cat i dont know why this is ,i cannot reset this myself as it does not have that function
iain
October 2008