I recently put a new highflow cat on my 1998 lude and the check engine light came on. the rest of my exhaust is stock, i also put a new o2 sensor on it and it didnt fix it. Do u think if i buy a o2 sensor spacer like the ones off ebay it would fix it? UNIVERSAL 02 SENSOR Oxygen Extension Adaptor spacer O2 : eBay Motors (item 290422552115 end time May-06-10 23:44:17 PDT)

hm... what code do you get? P0420?

is the highflow cat a replacement a swap piece or welded piece?

dude dont buy **** off ebay, just go to autozone and get something called a spark plug defouler thats what i have because my car threw a CEL after i put a test pipe in. there are threads on here on wat to do but all you have to do is take a drill bit and make a bigger hole in one of the defoulers and screw the one with the hole on top of the other then thread it into the hiflow cat and then problem solved. itll cost u 5 bucks and the size is 18mm. good luck

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1-CLEAN-SH
NYPOC

Idk what code im throwin i didnt check it yet. I auctally seen those in the help section the other day and was wondering if that would work. Thanks man

O and its a universal high flow and it has a o2 sensor bung welded in.

i'd check the code first. the freeze frame point tells you a lot about what's wrong.

it's possible that you might have a leak in the piping system.
O2 sensors can fire off CEL if it detects a leak to tell you "something is wrong~"

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want 4th gen or 5th gen prelude shirt!

just get a test pipe for 50 bucks, no restriction and the defoulers work.

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NYPOC

Yea its vibrint high flow cat and its pretty much nothing lol. I put the o2 sensor defouler in and it did the trick, it feels like it all around runs better too.

yea just go to pep boys thats where i got mine i just went catless exhaust and had them weld an o2 bung onto my straight pipe. Check engine light came on after a few miles! Went to pepboys bought the non fouler and reset the code and wa lah no more cel. Trust itll work!