O2 sensor, Where is it?
Thread Starter
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More Turbo
Joined: Nov 2004
Posts: 515
Likes: 6
From: Denver, NC
O2 sensor, Where is it?
I have a 04 F250 5.4. I have been told there are 4 O2 sensors. 2 upstream and 2 down stream. I need to replace Bank1 #2 sensor which is downstream. I only found 1 after the CAT but before the muffler. Where is the other one they say should be here? Which would be banl1 #2 when the CAT is on the past sside and there is only 1 CAT? Thanks
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
My 04' 6.8l only has 2 O2 sensors. They are located on the section of Y-pipe right behind the exhaust manifolds. (One on each side) I don't not have egr though.
Does your truck have EGR or is it setup for California Emmisions?
Does your truck have EGR or is it setup for California Emmisions?
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
Originally Posted by elmo8641
on my 03 i only have 2. both before the cat. on a single exhaust there will only be one after the cat. i don't know about 04 but mine is only obd I compliant.
Thread Starter
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More Turbo
Joined: Nov 2004
Posts: 515
Likes: 6
From: Denver, NC
I have single exhaust. So then I should only have 1 sensor after the CAT? I just want to make sure the right sensor was changed. I had a fellow tell me that if 1 is giving me trouble I should change them all. He also said that they should be change every few years and my fuel milage will suffer as a sensor gets older even if it still is good. Any truth to this?
Lead Driver
Joined: Jul 2003
Posts: 7,404
Likes: 52
From: Wheatland, Mo
Originally Posted by woody367
I have single exhaust. So then I should only have 1 sensor after the CAT? I just want to make sure the right sensor was changed. I had a fellow tell me that if 1 is giving me trouble I should change them all. He also said that they should be change every few years and my fuel milage will suffer as a sensor gets older even if it still is good. Any truth to this?
Elder User
Joined: Sep 2007
Posts: 803
Likes: 1
From: S CAL
The O2 sensor that is after the Cat is only there to determine if the cat is still working properly. It is the upstream O2 sensors that are used to determine fuel injection pulse width for the amount of air through the throttle body.
