i have a 98 ej and its throwing a p420 code. i replaced the o2 sensor but i have a high-flow cat. is there any way to bypass this code? i know im not the only person on here with an OBDII car with a high flow cat, so i refuse to put the stock cat back on.

 

An 02 simulator can bypass the P0420 trouble code. Give me a minute and I'll dig up the link.


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I went to this site only two weeks ago and the had simulators specifically for Honda engines. Now they don't, and only have universal ones, which I'm sure will work.

http://www.o2simulator.com/index.php...products_id=10




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so how does that work?

 

I have a 1998 Honda Accord with 155,000 miles. The check engine light recently came on with the P0420 code. I replaced the rear sensor with a bosch and I replaced the cat (not an oem). I am still getting this stupid light coming back on every 45 minutes after I cut it off. Will this work for mine also, or is this another problem?

 

Also, I was getting 30mpg before the light came on, now i am getting 22mpg.

 

Or you can build one yourself!
http://www.mkiv.com/techarticles/oxy...sor_simulator/

 

so does that simulator just plug into the o2 sensor plug, or into the ECU somewhere?

 

I am not 100% sure, you will have to look. But I think it splices into the O2 sensor wiring from the looks of it. Obviously htough you will have to splice it based on your ECU Diagram and not based on the one there for a Supra :X

 

oh, no i meant this one

 

Here you go:

http://cgi.ebay.com/ebaymotors/TEST-...item5ad333a9bc


no wiring
just screws on
stainless steel so it wont rust

 

i dont understand how that would work lol.

 

I'm not sure how that would work, unless its filled with cat material.

 

It works, I used it on every civic and accord I have owned. Use the search button if you dont believe me.

 

i've heard of people using those things for many years now. best i can figure is with the sensor further from the exhaust stream it reads less hydrocarbons and therefore prevents the catalyst efficiency code from being thrown.