i ask about a check engine light a few weeks ago...i finally went to a near by autozone and borrowed a scanner to check for the diagnostic code for the my MIL, it gave a P0420 code which is catalyst efficiency below threshold...now will the MIL or Check engine light go away if i get my self an o2 simulator or defouler..if so, will somebody please give a me a link to a site or online store where i get an o2 simulator or defouler..any help will be well appreciated...

 

do you have any mods

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nolia3du &raquo;</TD></TR><TR><TD CLASS="quote">do you have any mods
</TD></TR></TABLE>

AEM CAI, DC full race header and a WS 2 universal exhaust

 

WS 2 universal exhaust? Elaborate please.

Usually yes. If you have performance exhaust installed and the CEL comes on, a defouler will usually fix it.

You will have to have the codes cleared after installing it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Shiftyshadee &raquo;</TD></TR><TR><TD CLASS="quote">WS 2 universal exhaust? Elaborate please.

Usually yes. If you have performance exhaust installed and the CEL comes on, a defouler will usually fix it.

You will have to have the codes cleared after installing it.</TD></TR></TABLE>


Apex'i WS 2 universal exhaust...lolz

 

WOW!! I'm a tard late at night. For some reason that just didn't click at all.

Hope my reply helped a little though.

 

a race header will do it every time. Defouler...

 

Aye, it's not the exhaust, but it more than likely is the DCRH. Especially since it's talking about the cat (catalytic converter) specifically in the error code.

Get a Spark Plug Defouler and modify it for the Rear sensor so it sticks out futher from the header's piping. If you do a search on here, there's information on how to do exactly that.