]code for catylatic converter check engine light will not go off on 2005 Subaru Forester

do i need to replace the catylatic converter before i register the car I just bought it from a private party used and the light went on the next day after i got it. The other flashing light is the cruise control witch will not engage when you try to set cruise control

by in Tracy, CA on December 16, 2013
1 answer 3 comments
ANSWER by , December 16, 2013
What is the code for the convertor?
COMMENT by , December 17, 2013
P0420 I bet! Makes no difference, how many replies do we get anyway?
COMMENT by , December 17, 2013
green jelly will fix it. Advance auto has it ....$6.99 per 8oz. jug
COMMENT by , December 17, 2013
Shine is cheaper than that! It will fix anything, for awhile!