LucciLou

PO420
Definition: Catalyst efficency below threshold-bank 1
Probable Cause
aa1.-Failed Catalytic Converter
aa2.-Ignition System Malfunction
aa3.-Fuel System Malfunction

What does it all mean???

Juic

Do your headers have cats(by cats I mean catalytic converters)?

2+2=????

LucciLou

Negative they do not

Endika

Do you have the tokensolutions o2 delete module?

Juic

I thought you would put 2 and 2 together. Since you don't have cats the ECU thinks that your cats have failed.

You need one(2?) of these. They simulate the o2 signal so the ecu thinks everything is fine.

LucciLou

WTH R u guys talking about?

dvsjay21

hello everone im new here i have an is 300 2001.im thinking of doing headers and would like to know it there are any problems onces the cats are gone? and if so what do i have to do so i do not get a code and were to fine it if i need it

Isblkroof

So you need to buy a little box that hooks up to your harness(no idea how it hooks up just guessing it hooks up to harness somewere). I looked it up really quick first price i got was $150 so it then you either need someone to put it in or figure out how to put it in your self. When that is all done no more check engine lights or codes for faulty cat. But it while still throw codes for other things that aren't related to the cat. I just used the name that Endika posted (token solutions o2 delete module) and found it right away. Also my car has one not sure if its this exact one(bought it with it already on my car) but it worked for me went through DEQ no prob and it never gives me codes for not having a cat.

baadhabit

iTrader: (2)

http://www.tokensolutions.net/plug-a...00-mkiv-supra/

TofuMaster

iTrader: (4)

basically, if u remover the headers, youre removing the cats that are in it. thats why ur getting the code for failed cats cuz they dont even exist. the tokensolutions module tricks the ecu into thinking that the cats exist and thus "remove" the cause of error. please be intellectual and do a little research before you start modding your car and asking questions...why else do you think theres a big fat search bar at the top of the page? oh, and it might help if youre a little more polite when youre asking people for help.

LucciLou

Having this check light/malfunction is that going to affext my ecu or vehicle in a negative way....? because if im not wrong from what u guys r saying its confused thinking there is something wrong so will this effect my car in anyway???