Ok guys so I fix the knock sensor problem, I put one on there because I didn't have one and the CEL is not coming on anymore, now yesterday I was going to my girlfriends house and the CEL comes on again.
I was like well let me swing by AutoZone and see what it is.
It is P0420 or something well it says Low Catalyst Threshold Bank 1.
It is because I don't have a CAT isn't it guys??

Now, question for all, can I get rid of it, how??
Also, when the motor throws the CEL because of THAT specific problem what does the ECU do, like pull timing ir runs rich??
Cause I know there are stages or modes that the ECU goes in accoring to a problem, like with knock sensor it was pulling timing and running rich what does it do when I have a CAT problem?

Thanks


Best time:"""11.946""" @ 114.73 mph @17psi 1.83--60"
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Also, built bottom end and or top end LSJ and L61's available.
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yup thats because you do not have a cat

all it does is moniter the cat , doesnt effect anything unless you try to pass emissions

Ok so it is NOT going to effect my timing like the knock sensor did or make me run rich as hell like the o2 would right??




Best time:"""11.946""" @ 114.73 mph @17psi 1.83--60"
11 second daily driver!!!!
Race Related 727-561-9440
Shop of choice for your 11 second J body!

Also, built bottom end and or top end LSJ and L61's available.
13's ----12's ----11's ----10's

No, just an annoying cat. I believe an O2 sim would fix that problem




-da chinchilla

<img src="http://registry.gmenthusiast.com/images/jiggamon/avatar15569_2.gif">

thats if you can find get 1 that will work

they seam to be a 50/50 , they either work or dont

Well I can care less, and we don't have the emissions here in Florida, as long as it doesn't make the car run bad.




Best time:"""11.946""" @ 114.73 mph @17psi 1.83--60"
11 second daily driver!!!!
Race Related 727-561-9440
Shop of choice for your 11 second J body!

Also, built bottom end and or top end LSJ and L61's available.
13's ----12's ----11's ----10's

no that code tell you that the o2 sensor that is before the cat is not reading correctly.
i had the same problem and all i did is replace the o2sensors for bank 1 and bank 2
look on alldatapro.com and i will tell you how to fix the problem and it will also tell you
alot about recalls and tsb that are currently appling to your car