whats up fellas!
newbie here! wondering if you guys can help me out...
i just bought a used 02 "bug eye" wrx, the hks sqv bov was not making the whistling sound i love to hear as much anymore. i do remember the salesman saying that it has a leak. anyways, as i was driving home today & the check engine light came on!!! once i saw it, i immediately got pissed!!! luckily, i have a obII code reader and found the suby codes for it too...this is what popped up: P0420 catalyst system efficiency below threshold
what i want to know is...what the hell does that mean? is it something i can fix myself or should i take it in to get checked???