I keep getting the fuel system supply code(think its 42, I have OBD1 harness) , and noticed that im running too rich. I replaced the 02 sensor, and plugs with the oem part and it ran fine for a few months. Now my car is starting to have the same problems as before. Its killing my gas mileage again. Could it be that I drive back home from school every other weekend? That trip is 260 miles, its 4 hrs and I usually dont stop till I get home.
My Mods:Hondata S200 w/ stock P30 map, intake, and Apex N1 cat-back, still have stock exhaust manifold and cat.

 

running rich leaves unburnt fuel mixture leaving out your exhaust, causing excess carbon build up on your o2 sensor and causing it to foul out

since you have hondata s200 take the car to a local tuner and get it tuned and you will be fine and not foul out o2 sensors anymore

 

I had a similar problem..also how old is your cat...when mine went I experienced similar problems..

 

Thanks for ur info
My cat is as old as my car(95), now im runnin a p30 ?locash? chipped ecu

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeGSR &raquo;</TD></TR><TR><TD CLASS="quote">Thanks for ur info
My cat is as old as my car(95), now im runnin a p30 ?locash? chipped ecu </TD></TR></TABLE>

if youre running rich you will continue to damage cats and fou out o2 sensors, get it tuned with a new cat and o2 sensor and you should be good to go

if the car is obd1 a cat will not cause your o2 sensor to foul out because it is located before the cat, running rich seems to be your problem