want to replace O2 sensors
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Member
Joined: Jun 2005
Posts: 43
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From: Whitehall, MT
want to replace O2 sensors
first of all where are they? should i replace all of them? i dont have a clue about where to start on this so any help would be appreciated. thanks in advance.
Senior Member
Joined: Aug 2003
Posts: 111
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From: Frederick, MD
There are 4. Two before(upstream) of the cat converters and two below(downstream) of the cat converters. The upstream o2's tell the pcm how to set the air/fuel ratio along with other sensor inputs. The downstream O2's tell the pcm that the cat converters are there. You should replace the upstream O2's about every 30,000 miles because they tend to get "lazy" over time causing a loss of power and gas milage.
The OEM O2 sensors are Bosch and IMO should stick with OEM. Hope this helps - this was the cliff note version.
Jeff
The OEM O2 sensors are Bosch and IMO should stick with OEM. Hope this helps - this was the cliff note version.
Jeff
Senior Member
Joined: Sep 2003
Posts: 3,053
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From: Aggieland, TX
Why do you want to replace them?
Personally O2 sensors are something I would not replace unless you are getting codes or poor performance/gas mileage.
If you are set on this, just follow the exhaust pipes from the engine and back, there are two on each side of the truck.
$400 is extreme, I paid $80 something for a pair from advance auto parts. You can actually use the same (aftermarket) O2 sensor in all 4 locations. Get the Bosch ones.
I would also rent the removal tools...makes things a little easier. Also a 7/8" wrench is helpful.
If you need more info, do a search, there are lots of posts on this.
Personally O2 sensors are something I would not replace unless you are getting codes or poor performance/gas mileage.
If you are set on this, just follow the exhaust pipes from the engine and back, there are two on each side of the truck.
$400 is extreme, I paid $80 something for a pair from advance auto parts. You can actually use the same (aftermarket) O2 sensor in all 4 locations. Get the Bosch ones.
I would also rent the removal tools...makes things a little easier. Also a 7/8" wrench is helpful.
If you need more info, do a search, there are lots of posts on this.
Senior Member
Joined: Apr 2005
Posts: 691
Likes: 1
From: Augusta
Not a 400 dollar job at all. I changed all 4 of mine for 150 bucks and about 45 minutes of work. Ford quoted me 600 dollars just for the front two. Wow. Do it yourself. If you are getting bad gas mileage you should change them; if not i wouldnt worry about them. Mine threw a code when the front two went bad. Also i read somewhere that the rear two didnt need to be replaced that 99% of the time it was just the front two. But also heard that if you change 1 chang em all. Good luck
