Same here had Random Tech High Flow cats since 2003 no cat codes ever.
High Flow Cats And Codes
Thread Starter
Pro
Joined: Feb 2007
Posts: 621
Likes: 2
From: La Quinta Ca
High Flow Cats And Codes
i bought a set of magnaflow high flow cats and now i just need to know if i install them will codes pop up and if so should i buy some 02 sims or will i be ok. thanks, albert.
Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
Yes, Codes P0420 & P0430 will soon trigger your CEL in the DTC...so, Your best bet is to have your 2 rear (Bank 1 & 2) 02 sensors turned OFF...by a Tuner. "02 sims" will work initially, but are a "band aid", and most eventually fail...
Last edited by trussme; Dec 30, 2007 at 07:18 AM.
Thread Starter
Pro
Joined: Feb 2007
Posts: 621
Likes: 2
From: La Quinta Ca
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Racer
Joined: May 2006
Posts: 410
Likes: 1
From: NJ
ok you take your sensors off it wont pass the smog test unless you beat the hell out of your car right before you get it inspected to get it as hot as possible (reduces emissions), also you cant have any codes popping up or you fail, happened to my dad on his 98 vert and 01 Z they failed him on both of them. Anyway though if you get a handheld tuner i know that you can disable the O2 sensors, You should buy a handheld tuner cause they are always good to have about 300 for one, and then when you get the time or money run over and have your car dynotuned but disabling the O2 sensors with a handheld will get rid of the code.
Burning Brakes
Joined: Feb 2005
Posts: 752
Likes: 1
From: Tulsa OK
It takes a few seconds to reset the DIC.
Former Vendor
Joined: Jan 2006
Posts: 698
Likes: 0
From: Social Circle Georgia
For everyone that is not an 04, you may get a code saying the cats are not doing their job shortly after installing headers. You may have to clear this code once or twice. If it comes up a third time, go have them turned off. Basically the PCM is seeing a change it does not like. By clearing the code the first time, you're telling it to shut up and accept it. Some PCMs are stubborn and need a second shut up. I've never had one come up a third time.
For you guys with 04s, Random Technology makes an inline adapter that you plug into the rear O2 circuit that keeps the car from through the codes. This does not disable the rear O2s in any way, shape, or form. This year was very temperamental for whatever reason and turning the codes off or using these adapters are the only ways to keep the light off. The adapters are like $25 each I want to say. Any Random dealer can get them. Contact me or your preferred dealer if you're having issues.
rear O2s only measure catalyst efficiency. They have no effect on performance.
For you guys with 04s, Random Technology makes an inline adapter that you plug into the rear O2 circuit that keeps the car from through the codes. This does not disable the rear O2s in any way, shape, or form. This year was very temperamental for whatever reason and turning the codes off or using these adapters are the only ways to keep the light off. The adapters are like $25 each I want to say. Any Random dealer can get them. Contact me or your preferred dealer if you're having issues.
rear O2s only measure catalyst efficiency. They have no effect on performance.
