Cheating o2 sensors is it possible? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1000000to1 · 10-10-2010, 02:35 AM

I have a 2007 Avalanche on which I have a baffled glasspack no cats and no resonator. What I am wondering is if there is a way to cheat the o2 sensors so my engine light don't come on, I don't care if it does but my factory command start don't work when it's on. Any help would be much appreciated.

v502 · 10-10-2010, 07:44 AM

I don't think that's a good idea the O2 sensors are there to maintain the A/F ratio.

Getting a tune and turning the O2 check light off but still keeping the O2 doing it job is better approach.

**LEEVON** · 10-11-2010, 02:40 PM

You can have 02's tuned out of the computuer (front or rear) and you can also get 02 simulators. I'm not sure what the impact on driveability is, but pretty sure you need at least the front 02's

DaSchlange · 10-11-2010, 02:45 PM

I would definately keep the front ones. The back ones could go but it all depends on what you want. I know that you can get O2 simulators like mentioned above, but it's still not the same.

NCD1966 · 10-11-2010, 05:12 PM

you dont need the back O2s but you need the front ones for sure. I had some O2 simulators on my 98 Trans am. Then I ended up having the car dyno tuned and my tuner deleted the rear ones. I sold the sims to a guy tuning his own car.

Last I heard they dont make O2 simulators anymore. but I really dont know that for sure.
When I ran the simulators never really had a problem with them making my car run bad. Sometimes it would throw a code so I just unplug and plug them back and the code would go away.

**bwood** · 10-11-2010, 05:18 PM

The only company that I knew of making the simulators was Casper Electronics (or something along those lines) but they no longer make them.

Andy4639 · 10-13-2010, 08:00 AM

I don'y know if this works or not I haven't installed it yet. My daughters eclipse is running a free flow exshaust and it keeps the engine light on all the time. I got this from a member of the eclipse forum. Take the o2 senor out buy the spark plug non foulers and drill one of them out. If you have room use both of them and screw the o2 into the one you drill out. Then reinstall. Like I said I have no idea if it works or not.

1000000to1 · 10-14-2010, 04:16 AM

That might work, I had an 02 Z72 that I used for boggin and put straight pipe off the manifolds, the front o2's I put back but the back ones I tystrapped to the frame and that worked, I don't think the rear do much than tell the computer if to much carbon is getting past the cats so if the are outside the exhausts path all should be good.
Posted via Mobile Device

Andy4639 · 10-15-2010, 06:05 PM

Installed it yesterday afternoon. The car has been drove twice since. No light so far. Hope it keeps it off.

Andy4639 · 10-16-2010, 11:47 PM

The o2 has not thrown the code up now for 2 days of driving. I guess it worked.

Andy4639 · 10-17-2010, 05:51 PM

3 days of driving it and no codes as of yet!!!!! $300.00 saved for $3.00.

BarryB · 10-18-2010, 09:46 PM

Wow, this is a good thread because, I plan on pulling my cat of my 98 van. was wondering how i was going to get around those O2 sensors.

Shon · 10-19-2010, 09:49 AM

Just have the rear O2s removed from the PCM.
Keep the fronts so MPGs will be decent. if you remove the fronts too you will need to get the vehicle to stay in Open Loop.

IF you want the Rear O2s deleted (and some other smaller things) I can do that via mail order for $165 shipped back to you if you ship me the PCM, if you want other 'stuff' done let me know, we can work out something.

1000000to1 · 10-29-2010, 01:09 PM

I have since tried the anti foulers light came on, tried covering ends of o2's with caps light came on tried unpluging them light came on and then tried strapping them to the frame and light still came on so it looks like it's going to be a programmer. I want to lose the speed limiter anyways.
Posted via Mobile Device

Andy4639 · 10-31-2010, 06:47 PM

The daughters eclipse is going on two weeks and no codes. Sorry it didn't work for you.

wayfastwhitey · 09-02-2011, 01:49 PM

try packing the foulers with steel wool thats what the hemi truck guys do and it seems to work for them.

10-10-2010, 02:35 AM	#1
1000000to1 Registered User Join Date: Sep 2005 Location: Bienfait, Saskatchewan, Canada Posts: 308	Cheating o2 sensors is it possible? I have a 2007 Avalanche on which I have a baffled glasspack no cats and no resonator. What I am wondering is if there is a way to cheat the o2 sensors so my engine light don't come on, I don't care if it does but my factory command start don't work when it's on. Any help would be much appreciated. __________________ 2013 avalanche 5.3l 1971 Gmc 350 1958 Gmc fleetside

10-10-2010, 07:44 AM	#2
v502 Registered User Join Date: Oct 2009 Location: Portland, OR Posts: 198	Re: Cheating o2 sensors is it possible? I don't think that's a good idea the O2 sensors are there to maintain the A/F ratio. Getting a tune and turning the O2 check light off but still keeping the O2 doing it job is better approach. __________________ C10 Stepside Swap with 6.2 L92 & 6SP Auto 6L90 "Brain Check" Project

10-11-2010, 02:40 PM	#3
LEEVON Moderator Join Date: Jul 2006 Location: Ozark, MO Posts: 4,888	Re: Cheating o2 sensors is it possible? You can have 02's tuned out of the computuer (front or rear) and you can also get 02 simulators. I'm not sure what the impact on driveability is, but pretty sure you need at least the front 02's __________________ '20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids

10-11-2010, 02:45 PM	#4
DaSchlange Registered User Join Date: Sep 2010 Location: Gainesville, MO Posts: 251	Re: Cheating o2 sensors is it possible? I would definately keep the front ones. The back ones could go but it all depends on what you want. I know that you can get O2 simulators like mentioned above, but it's still not the same.

10-11-2010, 05:12 PM	#5
NCD1966 Registered User Join Date: Jun 2010 Location: Lafayette , La Posts: 404	Re: Cheating o2 sensors is it possible? you dont need the back O2s but you need the front ones for sure. I had some O2 simulators on my 98 Trans am. Then I ended up having the car dyno tuned and my tuner deleted the rear ones. I sold the sims to a guy tuning his own car. Last I heard they dont make O2 simulators anymore. but I really dont know that for sure. When I ran the simulators never really had a problem with them making my car run bad. Sometimes it would throw a code so I just unplug and plug them back and the code would go away. __________________ 1966 Chevy C10 Stepside 355ci sbc with 3speed OD 2021 GMC Sierra 1500 AT4 6.2 1980 Chevy Camaro z28 383ci 1990 Chevy Suburban 350 tbi 2x4 (sold) 1984 Chevy C10 sliverado short fleet 1997 Chevy C1500 short fleet

10-11-2010, 05:18 PM	#6
bwood Registered User Join Date: Jan 2003 Location: Denison, Texas Posts: 1,919	Re: Cheating o2 sensors is it possible? The only company that I knew of making the simulators was Casper Electronics (or something along those lines) but they no longer make them. __________________ 1998 GMC Sierra SLE 1/2 ton 2WD 305 Vortec -Gibson Stainless Cat Back Swept Side -SS Wheels 2005 Honda CRF250R 2006 Honda CRF150F

10-13-2010, 08:00 AM	#7
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Cheating o2 sensors is it possible? I don'y know if this works or not I haven't installed it yet. My daughters eclipse is running a free flow exshaust and it keeps the engine light on all the time. I got this from a member of the eclipse forum. Take the o2 senor out buy the spark plug non foulers and drill one of them out. If you have room use both of them and screw the o2 into the one you drill out. Then reinstall. Like I said I have no idea if it works or not. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-14-2010, 04:16 AM	#8
1000000to1 Registered User Join Date: Sep 2005 Location: Bienfait, Saskatchewan, Canada Posts: 308	Re: Cheating o2 sensors is it possible? That might work, I had an 02 Z72 that I used for boggin and put straight pipe off the manifolds, the front o2's I put back but the back ones I tystrapped to the frame and that worked, I don't think the rear do much than tell the computer if to much carbon is getting past the cats so if the are outside the exhausts path all should be good. Posted via Mobile Device __________________ 2013 avalanche 5.3l 1971 Gmc 350 1958 Gmc fleetside

10-15-2010, 06:05 PM	#9
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Cheating o2 sensors is it possible? Installed it yesterday afternoon. The car has been drove twice since. No light so far. Hope it keeps it off. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-16-2010, 11:47 PM	#10
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Cheating o2 sensors is it possible? The o2 has not thrown the code up now for 2 days of driving. I guess it worked. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-17-2010, 05:51 PM	#11
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Cheating o2 sensors is it possible? 3 days of driving it and no codes as of yet!!!!! $300.00 saved for $3.00. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

10-18-2010, 09:46 PM	#12
BarryB Senior Member Join Date: Jul 2006 Location: Blountville, Tn. Posts: 3,904	Re: Cheating o2 sensors is it possible? Wow, this is a good thread because, I plan on pulling my cat of my 98 van. was wondering how i was going to get around those O2 sensors. __________________ We could learn a lot from crayons... Some are sharp; some are pretty;and some are dull. Some have weird names; and all are different colours;but they all have to live in the same box. You may be only one person in the world, But you may also be the world to one person. * Some mistakes are too much fun to only make once. Two rules in life. 1. Never sweat the small stuff! 2. Everything is small stuff!

10-19-2010, 09:49 AM	#13
Shon Registered User Join Date: Sep 2005 Location: sc Posts: 1,203	Re: Cheating o2 sensors is it possible? Just have the rear O2s removed from the PCM. Keep the fronts so MPGs will be decent. if you remove the fronts too you will need to get the vehicle to stay in Open Loop. IF you want the Rear O2s deleted (and some other smaller things) I can do that via mail order for $165 shipped back to you if you ship me the PCM, if you want other 'stuff' done let me know, we can work out something. __________________ 71 Cheyenne C10 LWB cam'd 6.0/T56 Swap Last edited by Shon; 10-19-2010 at 09:49 AM.

10-29-2010, 01:09 PM	#14
1000000to1 Registered User Join Date: Sep 2005 Location: Bienfait, Saskatchewan, Canada Posts: 308	Re: Cheating o2 sensors is it possible? I have since tried the anti foulers light came on, tried covering ends of o2's with caps light came on tried unpluging them light came on and then tried strapping them to the frame and light still came on so it looks like it's going to be a programmer. I want to lose the speed limiter anyways. Posted via Mobile Device __________________ 2013 avalanche 5.3l 1971 Gmc 350 1958 Gmc fleetside

10-31-2010, 06:47 PM	#15
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Cheating o2 sensors is it possible? The daughters eclipse is going on two weeks and no codes. Sorry it didn't work for you. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.



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09-02-2011, 01:49 PM	#16
wayfastwhitey right below above average joe Join Date: Mar 2009 Location: palm bay, fl Posts: 107	Re: Cheating o2 sensors is it possible? try packing the foulers with steel wool thats what the hemi truck guys do and it seems to work for them. __________________ i flush the of weakness with mushroom clouds at hand '95 short bed x cab c1500... just another old truck someone else beat up, abused, hacked and didnt respect... my turn to turn it into a beat up old truck into a beat up and reliable pleasure to drive... them- "when you gonna put an exhaust on that thing?" me- "what do you mean? The exhaust comes all the way to the bumber and sounds great!" them- "straight pipes isnt an exhaust man..." me- "meh... who needs a fancy muffler when you've got straight pipes? its got a cat, doesnt resonate, and I like how it sounds, and to be perfectly honest, it makes me behave myself when I'm out and about!" ^^^ favorite conversation about my truck to date

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