po420 ej8
#1
Thread Starter
Join Date: Jan 2006
Location: southern, ca, usa
Posts: 310
Likes: 0
Received 0 Likes
on
0 Posts
po420 ej8
so my car is trowing this code right it says catalyst system efficiency below threshold. do you know what that means someone said i need a new cat or my o2 sensor is messed up. i want to hear what you guys say before i do anything and i would like to know if its going to mess it up driving it still. thanks in advance
#4
Thread Starter
Join Date: Jan 2006
Location: southern, ca, usa
Posts: 310
Likes: 0
Received 0 Likes
on
0 Posts
ok i know its my cat but what does that mean what is it doing to my car is my whole ******* car going to blow up or what im pretty shure that its making it slower because the exaust isnt going out corectly am i right
#7
Honda-Tech Member
Re: (EX-T)
p0420 means that your ecu is seeing your primary and seconadry o2 sensor switching alike, they are not suppost to, primary o2 should switch quickly and cat moniter should have a slow switch rate. when it sees them switching the same it is because the cat is not operating efficently and will need to be changed so it tosses you a p0420
Trending Topics
#8
Re: (N20civicB18)
had the same problem a few weeks ago, I though it was the oxygen sensors but I took the cat off just to inspect and the whole inside of the cat melted and fell apart, it happened because I ran extremely rich for just a few minutes
Thread
Thread Starter
Forum
Replies
Last Post
redciviclx14
Honda Civic / Del Sol (1992 - 2000)
10
07-08-2003 07:39 PM