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01-29-2009, 10:34 AM
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#1
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Member
Join Date: Dec 2008
Location: Oak Forest, IL
Posts: 74
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O2 Sensors
I have an 04 GTO, 4-speed automatic with stock exhaust. How many total oxygen sensors are on this thing, 4? What is the setup? 2 upward, 2 downward? Just curious if anyone knows. One of them is throwing a code.
Thanks guys!
Last edited by cowboyili; 02-24-2009 at 11:57 AM.
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01-29-2009, 12:06 PM
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#2
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Super Moderator
Join Date: Apr 2003
Location: Southern Illinois
Posts: 3,333
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__________________
2004 GTO: IBM/Blue A4 (1 of 369)
K&N CAI, JBA shorty headers & catted mids, SLP LM1, Pred. tuner, ported stock TB and MAF ends, Derale trans pan cooler, 180 Tstat, TB coolant bypass, Hankook Ventus V12's, King 0" drop rear springs, drag bags, Monroe Sensa-Trac rear shocks, SLP rear sway bar w/ end link bushings, Lovell's RR bushings, BMR skidplate, tow brace delete kit, DEPO black tail lamps, SCSS pod w/Aeroforce gauge
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02-24-2009, 09:50 AM
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#3
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Member
Join Date: Dec 2008
Location: Oak Forest, IL
Posts: 74
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O2 Sensors
Ok, so which set of oxygen sensors is the "upstream" and which is the "downstream?" They both appear to be pointing downwards....
Anyone?
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02-24-2009, 12:01 PM
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#4
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Senior Member
Join Date: Jun 2006
Location: Oregon
Posts: 354
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Quote:
Originally Posted by cowboyili
Ok, so which set of oxygen sensors is the "upstream" and which is the "downstream?" They both appear to be pointing downwards....
Anyone?
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"upstream" = Before the cats, closest to the engine.
"downstream" = After the cats, furthest from the engine.
It doesn't mater which direction they are pointed, just the location.
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02-24-2009, 01:40 PM
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#5
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Member
Join Date: Dec 2008
Location: Oak Forest, IL
Posts: 74
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O2 Sensors
Cool. Thank you very much for the help! My O2 sensors are throwing a code and there is a huge difference in pricing between the upstream and downstream sensors. I figured I would try the cheap ones first and see if it fixes it.
Thanks for all of your help! It has much appreciated, guys!
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02-25-2009, 12:23 AM
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#6
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Senior Member
Join Date: Jun 2006
Location: Oregon
Posts: 354
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Quote:
Originally Posted by cowboyili
Cool. Thank you very much for the help! My O2 sensors are throwing a code and there is a huge difference in pricing between the upstream and downstream sensors. I figured I would try the cheap ones first and see if it fixes it.
Thanks for all of your help! It has much appreciated, guys!
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I bet its the one after the cats. Do you have a way to check which code?
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02-25-2009, 10:11 AM
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#7
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Member
Join Date: Dec 2008
Location: Oak Forest, IL
Posts: 74
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O2 Sensors
Yeah, I can go to AutoZone and find out what error code it is. There is a different code thrown for upstream and downstream huh?
I will try and get the code tonight. Thanks for all of your input!
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02-25-2009, 11:41 AM
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#8
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Super Moderator
Join Date: Apr 2003
Location: Southern Illinois
Posts: 3,333
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Every once in a while you can find an owner who is selling their used 02 sensors because they went with catless headers. I got one from a fellow 04 owner off another board for quite less than new. Look around you may be able to find one relatively cheap. Yes the rears are more expensize than the fronts unfortunately.
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__________________
2004 GTO: IBM/Blue A4 (1 of 369)
K&N CAI, JBA shorty headers & catted mids, SLP LM1, Pred. tuner, ported stock TB and MAF ends, Derale trans pan cooler, 180 Tstat, TB coolant bypass, Hankook Ventus V12's, King 0" drop rear springs, drag bags, Monroe Sensa-Trac rear shocks, SLP rear sway bar w/ end link bushings, Lovell's RR bushings, BMR skidplate, tow brace delete kit, DEPO black tail lamps, SCSS pod w/Aeroforce gauge
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02-25-2009, 12:25 PM
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#9
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Member
Join Date: Dec 2008
Location: Oak Forest, IL
Posts: 74
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Okay, that brings up another question. I live in Illinois, this car is a daily driver, and I have researched exhaust options. I have been told that once you put aftermarket exhaust on, theres no longer a spot for the O2 sensors after the cat. I suppose you would disable them using a tuner?
Anyway, so if you put catless headers on - does that disable the pre-cat O2 sensors too? Wondering what options I have because I know I have to go to Illinois emissions test every 2 years too.
Say I got an aftermarket cat-back and disabled my post-cat O2 sensors....when the emission testers plug into my OBC, is it going to cause any issues?
Thanks for your input guys, this is the only place I get certain answers.
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