P0420.......

[rjmq06]

so my ecu throw this code and im kinda confused if i have a bad cat or the 02 sensor
cause some people say its sensor and some say its the cat
so which one is it?
need help
thanks in advance

[smykhaisouk]

you have a bad cat. get a new cat at honda for 800.00+? or get a defouler at autozone for 3 bucks and hook it up to your rear o2 sensor.

[rjmq06]

do you know what kind of brand/size/car model of defouler should i get??
cause i called them and they dont have it for our car and they have it for civic ex,
and let me clear its suppose to be the spark plug defouler right

[Anrasmor]

do you know what kind of brand/size/car model of defouler should i get??
cause i called them and they dont have it for our car and they have it for civic ex,
and let me clear its suppose to be the spark plug defouler right

They usually have a universal one.

[LOVIN MY EP3]

Its the cat I had the same code and found out the cats on ep3 are not that great I went to a shop and asked them for a cat that is legal incali and out the door it was something like $200

[rjmq06]

damn thats expensive for just a OEM
i wonder if i can use a aftermarket one that comes with everything
and i wonder whats the difference between the OEM and aftermarkets?

[AzNCrAzYcOoLeR]

I got the magnaflow cat installed, and it still throwing a light. I'm going to do the defouler trick asap

Changed the front and back sensor, no help.

[WigginsSiR]

P0420 ehh.... sounds like you car is smokin the reefer:hat::couch2::hippie:

[rjmq06]

hey dude let me know if the defouler trick works and also can you tell which one to use for the defouler cause theres different things that i saw at the store and different sizes too

[K20wagon]

To do the defouler trick at autozone you have to buy 2 of them. I forget what size it is but I think it is the size right above the size of our spark plugs.
You have to get then and you have to drill out part of the hole a little I think. They also sell the defoulers on corsport and club ep3.

[rjmq06]

is that the only way??
well im kinda debating about the drilling and also,
can i just use a washer/spacer??

[BeaterEP]

Just pick up an after market cat at an exhaust shop.

[Silvercard]

I got race headers and got the same code. So i put a de-fouler on the 2nd one and it went away. I got if off ebay too for like 4 bucks i think