okay, crap. i had the codes pulled a week or so ago. came up with a p410 and p420. had them erased only for them to return a day later. actually, each one repeated also, for a total of four codes. 410x2 and 420x2. all within 4 days. any ideas of what could cause/fix this problem? thanks for the info.
dave

ps-
p410-secondary air injection system malfunction
p420-catalyst system efficiency below threshold (bank 1)

 

420, your driver side cat is either not working properly or your driver side rear o2 sensor is defective.

 

i had the same problem code po 420 and the light went back out yesterday i asked on here too and everyone told me either o2 sensor bad or cataalic converter tell me how u make out