hey guys me and my 99 rs again. ok my CEL came on and i took her to auto zone to use their obd 2 scanner. lol it took me about 5 mins of where to plug it in. ^^ anywho, i got the code it came out to p0420 " the pcm has determined that the catalyst system efficiency for bank 1 is below threshold for the current engine operating conditions." what is my first step of action? i dont believe my engine is misfiring, there is no oil going into my engine, (i just did a tune up.. i was thinking that i didnt gap it properly) but my idle does surge at idle and when i rev. so maybe vacume leak, does anyone have a diagram i can look at? and thanks in advance for your help. ^^

 

You have a bad cat, p0420 is a cat efficeny code. Replace the cat and your good to go.

 

how much do those usually run for? or can i just somehow clean mine out? and im not a pro mech but can i do it myself if i had the tools?

 

You cant really clan it out, once they go they go. Go to autopartswarehouse.com for prices on cats. They are usually pretty cheap.

 

They have a platinum screen in them, once that wears out, its toast. I actually melted one once