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Username Post: oxygen sensor delete for lt1        (Topic#62385)
Senior Member
Posts: 322

Loc: North Carolina
Reg: 03-17-03
04-07-04 05:05 AM - Post#424130    

Need help finding a source for something i saw once on Ebay it was a adapter you plug your o/2 sensor cable in which made the engine think you had a o/2 sensor attached can anybody here point me toa source for it. if you like you can e-mail me at


Senior Member
Posts: 785
Loc: Raleigh, NC
Reg: 11-14-02
Re: oxygen sensor delete for lt1
04-07-04 08:13 AM - Post#424131    
    In response to chevies4ver

What you might have seen is an adapter for LS1s that allows you to bypass 2 of the 4 oxygen sensors so you won't set an error code when running this engine in a non-emission application.

Why would you want to bypass that anyway?


'56 Nomad, CT# 63, C4 front and rear suspension, LS1/6speed '05 Pontiac GTO/M6

Ultra Senior Member
Posts: 11073
Loc: Ft. Collins, CO .....
Reg: 09-22-01
Re: oxygen sensor delete for lt1
04-07-04 08:20 AM - Post#424132    
    In response to toneking


Why would you want to bypass that anyway?

I was wondering the same thing.

'56 Nomad, C4 Vette F&R suspension, Ramjet 502, Viper T56 6 speed See My Nomad Build
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Honored Member
Posts: 27334
Loc: Katy, Tx, USA
Reg: 07-06-00
Re: oxygen sensor delete for lt1
04-07-04 01:35 PM - Post#424133    
    In response to chevies4ver

As Toneking said there are "simulators" to replace the rear pair of O2 sensors for cars that have them. All cars that have OBD2 engine controls (96 up) have them. So that would include 96-97 LT1's as well as all LS1's. This would possibly be useful in an engine swap or with a custom exhaust, as you wouldn't have to weld in the extra bungs, and you'd slightly clean up the wiring. The second pair of sensors is not used to control the engine, but only to monitor to see if the engine controls are working properly, especially the "working" pair of O2 sensors. If you simply unplug the rear pair of sensors, you'll get an SES light and a code but the engine will function normally. So the only benefit of deleting them is to reduce the $ and trouble to install them.

On the other hand, if you wanted to get rid of the O2 sensors entirely, this scheme won't work - you'll never go into closed loop operation and you'll get codes. Another way around the use of the second set of sensors on an LT1 is to convert the 96-97 model to run on a 94-95 computer/wire harness so that it doesn't even use the second set of O2's. There may be other benefits to converting to OBD1 if you have modified the engine.

I think the simulators are in the Summit catalog. For other sources go to the forums at and do a search.

Senior Member
Posts: 1829
Loc: Flower Mound, TX,
Reg: 03-27-02
Re: oxygen sensor delete for lt1
04-07-04 04:47 PM - Post#424134    
    In response to chevies4ver

Here's a top notch source.


"Yeah, I'm just going to clean it up and make it a driver." May 2002

'57 BelAir Conv. GMPP LSX/L92-440 T-56 (almost...)
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