Rear 02 sensors in headers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Az. Hank · 07-10-2016, 04:48 PM

This might sound dumb but my 02 sensors are pointing out to the side and going to hit the frame. Can I cut them out and weld them back in from the top or will that affect the way they work?

Custom 68 · 07-10-2016, 08:21 PM

You really don't need the rear ones. They would need to be tuned out tho. They are also to be after cats so they won't read correctly if you don't have then placed after the converters. But if they are the front ones yes they can be moved so they don't interfere.

Az. Hank · 07-11-2016, 04:00 PM

OK thanks.
I got my wiring harness and ECU from PSI and did away with the other stuff. Thought I needed the rear ones to make it run right.

Custom 68 · 07-12-2016, 10:16 AM

my understanding is that in the new cars they check the function of the cats. If they are not doing their job properly then they will show a code. They are also used for the smoggers. I understand they can just plug into the computer and look to make sure you have not done away with the cats and all is functioning.
Most of the swaps do away with the cats as well as the rear o2 sensors. The front ones do give feedback and control to the computers. They can also be tuned out but most don't recommend getting rid of them.
Good luck
Dave

Az. Hank · 07-14-2016, 09:12 PM

Oops, my bad I ment the front two in the rear of the headers. I forgot there four altogether. I eliminated the two in the rear.

07-10-2016, 04:48 PM	#1
Az. Hank Registered User Join Date: Feb 2009 Location: Fort Mohave, Arizona Posts: 207	Rear 02 sensors in headers This might sound dumb but my 02 sensors are pointing out to the side and going to hit the frame. Can I cut them out and weld them back in from the top or will that affect the way they work? __________________ My 55 Build 55 C-4

07-10-2016, 08:21 PM	#2
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: Rear 02 sensors in headers You really don't need the rear ones. They would need to be tuned out tho. They are also to be after cats so they won't read correctly if you don't have then placed after the converters. But if they are the front ones yes they can be moved so they don't interfere. __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

07-11-2016, 04:00 PM	#3
Az. Hank Registered User Join Date: Feb 2009 Location: Fort Mohave, Arizona Posts: 207	Re: Rear 02 sensors in headers OK thanks. I got my wiring harness and ECU from PSI and did away with the other stuff. Thought I needed the rear ones to make it run right. __________________ My 55 Build 55 C-4

07-12-2016, 10:16 AM	#4
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: Rear 02 sensors in headers my understanding is that in the new cars they check the function of the cats. If they are not doing their job properly then they will show a code. They are also used for the smoggers. I understand they can just plug into the computer and look to make sure you have not done away with the cats and all is functioning. Most of the swaps do away with the cats as well as the rear o2 sensors. The front ones do give feedback and control to the computers. They can also be tuned out but most don't recommend getting rid of them. Good luck Dave __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

07-14-2016, 09:12 PM	#5
Az. Hank Registered User Join Date: Feb 2009 Location: Fort Mohave, Arizona Posts: 207	Re: Rear 02 sensors in headers Oops, my bad I ment the front two in the rear of the headers. I forgot there four altogether. I eliminated the two in the rear. __________________ My 55 Build 55 C-4

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