|How To Replace O2 Sensors on a Mustang|
For some of you Mustang folks out there who may be new to wrenching, here is a relatively simple project that can improve the performance of your Mustang. If your car has over 100,000 miles and still has the original oxygen sensors, it wouldn't be a bad idea to replace them as part of a good tune-up.
First, simply jack up the car and secure it safely with a pair of jackstands. You can put the stands under the subframes, engine crossmember, or other secure place on the car.
Then, it's time to locate your O2 sensors. They are located on your exhaust mid-pipe all the way forward near where it attaches to your headers. If you have a factory catalytic h-pipe, they are located forward of the two forward-most cats. I have a Magnaflow catalytic x-pipe on my daily driver, so I only have two cats and the O2 sensors are super easy to get to.
Here's the old driver side sensor:
Here's what it looks like from a bit further back:
Here's the passenger side sensor:
...and from a bit further back:
After you've located them, simply disconnect the two sensors. All you have to do is push down the little tab and pull them apart.
Then grab your 7/8" wrench and unscrew the sensors. If it's too tight a fit and you can't get a wrench on them, the special O2 sensors socket might be a better choice here.
Now you need to grab your two new oxygen sensors and reinstall them. A word of caution/advice here - USE ONLY FACTORY ORIGINAL EQUIPMENT OXYGEN SENSORS. I've discussed this at length with several knowledgeable folks who I trust to know precisely what they're talking about, including one who owns a dyno facility and has been tuning cars for over ten years. They say that the calibration of other common aftermarket sensors that can be purchased at auto parts stores is not as accurate, and does not always send the appropriate signal. The OEM Ford sensors cost a bit more, but I think it's worth it for the peace of mind knowing they'll work correctly.
There are 24 comments
April 12, 2014 - 04:43 PM
This being the absolute best pics I've found, I'll post what I've learned in hopes it helps others.
August 01, 2013 - 09:11 AM
Subject: Drivers Upstream O2 Sensor
Is there a short 12" or so wire that connects to the wiring harness that drops down to the Drivers side O2 Sensor. Rebuilding the Stang and cannot locate a connection for this O2 Sensor. There is one connector near the battery box that I cannot locate where it goes to also the O2 sensor connector.
July 08, 2013 - 02:52 PM
Subject: Rear sensors
What color sensor goes on which side on the rear sensors. The front ones ar both the same color but rear are not the same.
May 08, 2013 - 02:48 PM
Subject: o2 Sensor.
My car makes a really loud rattle noise that comes from the engine when the car gets hot. I am also unable to get enough power when I press on the gas. The noise only comes when I push the push hard. Is this because of a O2 sensor?
May 18, 2012 - 09:54 AM
Subject: How many sensors?
Hi there guys, how many oxygen sensors are in the ford mustang 2002 standard? Thanks.
May 16, 2012 - 05:21 PM
Subject: sensor replacement
what side is 02 bank 2 on driver or passenger?
March 01, 2012 - 06:45 PM
Okay, so I have a 98 cobra. It currently has bbk longtube headers and a bbk x midpipe. I'm currently getting the code p1152. I was adviced by another forum to change the drivers side pre cat 02 sensor. I'm not sure if that's the sensor that connects to the headers, or the one that is connected to the midpipe. Can you please help me on where it is located? Thanks for the help in advance.
August 08, 2011 - 07:17 PM
I had an extremely difficult time with the passenger side bank 1 sensors on my 98 Mustang but enevtually got it. Thanks!
July 12, 2011 - 03:45 PM
Subject: which o2 sensor os upstream and downstream?
I'm replacing the o2 sensors and I'm unsure about which is the upstream or downstream sensor can you clarify?
April 29, 2011 - 12:56 PM
How do I know which 02 sensor to replace
June 02, 2012 - 11:38 PM
Subject: Replace o2 sensor
replace both. same thing as spark plugs if one goes out why spend hours find which one just replace them all and fix the problem.
April 21, 2011 - 04:15 AM
Subject: 1998 Mustang Gt
My mustang has been having terrible mpgs (around 10) and the check engine light was on for about a week, then turned back off. I believe that it was an o2 sensor code, but I can't remember. What is the best choice for determining whether or not to replace the sensors, and which ones should be replaced?
March 10, 2011 - 09:43 AM
This will be my first attempt at this,
- Thanks, Mike - 352 !!!!
March 10, 2011 - 09:13 PM
February 14, 2011 - 04:57 PM
Subject: Changing the right-side rear sensor
I'm changing it in a few weeks (P0141 code repeatedly). I'll put the rear up on jack stands. Will removing the rear tire make things easier for me?
February 24, 2011 - 10:34 PM
Subject: Re: Changing the right-side rear sensor
It's not necessary but may free up some room for you.
January 25, 2011 - 04:39 PM
is it possible to clean the sensors with Mass Air Flow sensor cleaner? Thanks
February 24, 2011 - 10:36 PM
I would not recommend it. If you think your o2 sensor is not functioning properly you should replace it. Here is one on eBay
November 27, 2010 - 02:45 AM
Subject: If there is 4 sensors then wher are thay???
I see the 2 sensors under the car, one on the driver side, and the other on the passenger side, in the pipe, so where are the other 2 located at?
September 06, 2010 - 06:15 PM
Subject: How do you access the pre-catalyctic sensor (right side)?
Thanks for answering my earlier post. Can't seem to access the right side. The left side was hard enough... only a small hole to squeeze your hand through. The wrench isn't the issue but undoing the connector is a killer. Any advice?
September 06, 2010 - 06:21 PM
No problem. What about some sort of pry bar, maybe a PVC pipe around the wrench?
August 27, 2010 - 03:57 PM
Subject: Which O2 sensors for Bassani X pipe??
I want to replace my O2 sensors on my 01 GT. I have a Bassani X pipe w/cats installed and need to know which side does either one install onto pipe?? I understand that there are front and rear sensors. With only two cats, which goes where? Thanks
August 17, 2010 - 04:30 PM
Subject: Call me nuts but are there only two O2 sensors???
I need to replace my O2 sensors - unfortunately Ford wants to charge me over $100 bucks each. I am seriously thinking about going for after-market parts. However, itf there are only 2 sensors, it wouldn't be too bad...
So are there only two O2 sensors on a 2002 Mustang GT (automatic)? Please let me know... I'm getting conflicting answers... some people say 2, some say 4....
August 17, 2010 - 06:47 PM
Subject: Re: Call me nuts but are there only two O2 sensors???
Hi Helen. There are actually 4 oxygen sensors stock on your 2002 Mustang GT. There are 2 pre-catalytic converter that may not be highly visible until you are under the car. I had to replace 2 sensors on my car and I used these Mustang Oxygen Sensors.
Use this write up to help guide you through the replacement and you should be on your way. Don't hesitate to ask any more questions either, and if you're looking for a great Mustang Forum , check out NewYorkMustangs.com
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