Did I replace wrong 02 sensor the whole time ?
- Thread starter Killa
- Start date
sorry, Im honestly unsure to your question
There are four 02 sensors that connect to the midpipe......
the98stang
Active Member
The 2 rear sensors essentially do nothing. The front o2 sensors actually send important signals to your PCM. So yes, you have 4 sensors stock, but the 2 rear are worthless.
BennyBlown2v
New Member
Not just that - the rear O2's and front O2's in our cars are NOT the same parts. In some GM's the front and rears are the same parts, but not for us!
lvmustanggt
New Member
I call napa, oreily, autozone, advance autopart, and the brand they only carry is BOSCH and all front and rear is same part # 13127. I call the dealer and they told me that, 2 are different part number, and its cost $96-$100 each, I cant spend $400 on those 4 sensor, cause I accident throw away 2 rear factory sensor away. Can any one tell me the right part number for front and rear sensor, How do you guy remove the front sensor ? thanks
lvmustanggt
New Member
http://www.automedicsupply.com/catalog.php?&pkey=1385670
Check this website. If you go to autozone tell them you need 2 for before cats and 2 for after cats
Check this website. If you go to autozone tell them you need 2 for before cats and 2 for after cats
281CI96Coupe
Member
- Oct 30, 2006
- 233
- 0
- 16
Actually, I beg to differ. When I had fault codes from my rear sensors, my car didnt run up to par...the heater circuits in the o2's were malfunctioning. So i bought new ones and took the MIL's off. Car runs a million times better with no CEL.
jstreet0204
Active Member
They are different part numbers only due to the length of the harness. They are however the same bosch 4 wire o2's and are interchangable. The different functionality of the front and rears is controlled by the PCM, not the part itself. This is why the part stores carry the same part number for front and rear.
twogts4us
15 Year Member
The rear o2 sensors are just about the same and work the same as the fronts but what the PCM does with them is very different.. The front pre cat 02's are used for fuel trim adjustment and the rear 02's are used to monitor cat efficency.
BTW why are you replacing the sensors??? If it's for a check engine light you may want to do a full diag before you spend money.
BTW why are you replacing the sensors??? If it's for a check engine light you may want to do a full diag before you spend money.
few month ago, my car suddently burn alot of gas , and exhault smell like burning gas and little of smoke, it throw a code so I went to autozone and check it, it turn out that my 02 sensor, I bought it and replace down stream one ( cause that wat I thought I only have 2 o2 sensor, i dint knew there was 2 upstream one), the code is gone and car ran great, until the other day I get under the car and found 2 more ( upstream , that look like 02 sensor ), so I want to replace that too, then I went to autozone and look it up then find out that is the same part, so i went home and try to install it , it wont fit, so I find out that 2 in the front are different from 2 in the back, I went and got my moneys back ( 3 month old 02 sensor and still can get full refund 
).
https://www.automedicsupply.com/about.php?
should I go with motorcraft or denso or walker ? thanks
1. PRE-CAT LEFT
2. PRE-CAT RIGHT
3. POST-CAT LEFT
4. POST-CAT RIGHT
what those mean ? BTW I ran the car without 2 rear sensor is that ok ? any body knew that side of plug that I can screw its in that rear 02 sensor threat . my exhault alot loud and my rpm jumping around.
). https://www.automedicsupply.com/about.php?
should I go with motorcraft or denso or walker ? thanks
1. PRE-CAT LEFT
2. PRE-CAT RIGHT
3. POST-CAT LEFT
4. POST-CAT RIGHT
what those mean ? BTW I ran the car without 2 rear sensor is that ok ? any body knew that side of plug that I can screw its in that rear 02 sensor threat . my exhault alot loud and my rpm jumping around.
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