ok i have a 1996 eclipse gs which is completely stock and for about the last year my check engine light has been coming on, when i did the key dance i got code 72, and when i went to autozone they gave me code P0420 and the description "the pch has determined that the catalyst system efficiency for bank 1 is below threshold for the current operating conditions." I had them turn it off several times and i found that if i buy premium gas the light wouldn't come back on as soon, but now it only stays off for a couple days. My guess is that the catalytic converter needs replaced but im really not sure. Also I don't know if this is related or not but recently every so often when i try to start the car it cranks but doesn't start right up i have to hit the gas to make it start; or it starts then shuts right back off. Any suggestions would be greatly appreciated
Thanks,
~Shawn

well 'bank one' usually referes to your front o2 sensor.

If you cat was goin on your car would smell like shit

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~Chris
03 SRT-4

it did have that rotton egg smell last spring, but I havent noticed it since then