Check Engine-0420 code
Thread Starter
Registered!!
Joined: Aug 2005
Posts: 185
Likes: 0
From: naptown, Indy
Rep Power: 0 
Check Engine-0420 code Just got a 2001 Civic HX 5 speed 38000 miles, i have a 0420 code that meast exhaust threshold exceded? Also i would like to know if you guys think i paid a good price for it? it has tinted windows new tires a header(unknown brand) AEM long intake and a tru duel exhast, paint is in excelent conditinon, its the only one i have seen with its color. it is a very very dark blue almost black with a blue metalic to it in the sunlight any help on what the code could be would be helpful.
Registered!!
Joined: Dec 2003
Posts: 578
Likes: 0
From: Dallas "Big D", TX
Rep Power: 278 I think* that the HX has the Cat in the header like an lx. (* this is off the top of my head so I could be wrong) If that is the case & the header has been replaced you need to get an o2 simulator for your secondary sensor. Maybe someone with more HX knowledge can confirm or correct what I said.
IF, i repeat, IF the hx exuast set-up is just like the LX/DX. than its the header. the o2 sensor i believe was located within the header. therefore, by replacing the factory header with an aftermarket that has no function of a cat converter, it is throwing a bad o2 sensor code.
Thread
Thread Starter
Honda Civic Forum
Replies
Last Post
Flipg123
Mechanical Problems/Vehicle Issues and Fix-it Forum
1
May 8, 2015 01:15 PM
alexkharden
Mechanical Problems/Vehicle Issues and Fix-it Forum
10
Apr 23, 2015 07:13 PM
