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  #1  
Old 09-07-2012, 05:40 PM
Echofall Echofall is offline
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Default How-To: Oxygen Sensor replacement

***Ford Ranger Forum and myself are not responsible for any damage done to your exhaust or your truck, nor any injuries to yourself during this procedure. Please wait for your exhaust, engine, and brake system to cool down before attempting this repair. It is highly recommended to use approved jack stands in good serviceable condition while the truck is lifted. Please read any warnings and cautions on any tools and equipment you use. Please use caution and take your time***


This is a How-To on replacing an oxygen sensor. In this How-To, we will be looking at how to replace the Bank 1 Sensor 1 on a 2003 Ranger with the 4.0L.

Bank refers to the side of the engine the sensor is on, Bank 1 referring to the side with the number 1 cylinder. In a forward facing engine, this will be the passenger side. Bank 2 would be the driver's side. Sensor refers to the location of the sensor in comparison to the catalytic converter, Sensor 1 is before the catalytic converter or 'upstream.' Sensor 2 is after the catalytic converter or 'downstream.' Inline 4 cyl's only have one bank.

Tools Required:
penetrating lubricant
7/8" wrench or oxygen sensor wrench
mallet or breaker bar
diagonal cutters
tire iron
floor jack
jack stands
anti-seize


The sensor we are after is accessed best through the right front wheel well.

- Start by loosening the lug nuts on the right front wheel. Using a floor jack, lift the truck off the tire, and support the weight of the truck on your jack stands. Remove the tire.

- Pull the splash guard to the side as such


- Now you can see the sensor, as circled in the picture. Spray your favorite penetrating lubricate on it and let it sit for a bit. While you wait for the lube to do its thing, go a head and follow the wire pigtail up behind the engine and disconnect it. Location shown with arrow.


- Since the sensor is junk, go ahead and use your diagonal cutters to cut the wire pigtail as close to the sensor as possible, unless you are using an oxygen sensor wrench.


- With the wire out of the way, you may now use the box end of your 7/8" wrench to remove the sensor. You may also use a special oxygen sensor wrench, which doesn't require you to cut the wires.


- Using a rubber mallet, tap the end of the wrench counter clock-wise until you have broken the torque loose. Depending on how much corrosion you have, you may need to use a breaker bar. Once you break the torque, you should be able to unthread the rest by hand.



-Apply a bit of anti-seize to the threads of the new sensor. For mine, Bosch had already applied it for me


- Thread on the new sensor. Be careful of the wires while doing this, use one hand to thread the sensor while using the other hand to support and turn the wires as you turn the sensor. Thread the sensor until the washer bottoms out.


- Use the open end of your 7/8" wrench to torque the sensor and seat the crush washer... It took me about half a turn for mine.


- Connect the pigtail to its location


- Wipe off any excess penetrating lube off the exhaust, the rest will burn off after about 10 minutes of engine run.

- Reinstall splash guard, install the tire, lower the truck. Make sure all your tools are accounted for.

Each engine my be different as far as how to get access to your sensors and wire plugs, I hope this how-to can serve as a general example of how to remove the sensors.
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  #2  
Old 09-08-2012, 06:03 AM
Devin-20 Devin-20 is offline
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Great write up. Im sure it will be very useful.
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  #3  
Old 01-07-2013, 09:59 AM
Answer069 Answer069 is offline
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Default Re: How-To: Oxygen Sensor replacement

well after I have recently done this on my 92 3.0 I can tell you that the pig tails run up behind the motor. Bank one is a Pita to get to it's attached to the AT dipstick tube and you really can't get your hands back there to unplug it easily. I ended up prying it off of where it was mounted to be able to unplug it. Bank 2 wasn't quite so bad.
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  #4  
Old 01-07-2013, 10:08 AM
reconjb reconjb is offline
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Default Re: How-To: Oxygen Sensor replacement

nice write up and i also found out when i did my o2 sensor if you do it right after you get back from somewhere so it is nice and hot that thing comes out rather easy
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  #5  
Old 01-08-2013, 07:58 AM
Echofall Echofall is offline
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Quote:
Originally Posted by reconjb View Post
nice write up and i also found out when i did my o2 sensor if you do it right after you get back from somewhere so it is nice and hot that thing comes out rather easy
Good tip, just be careful of the exhaust manifold
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  #6  
Old 01-08-2013, 07:59 AM
reconjb reconjb is offline
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Default Re: How-To: Oxygen Sensor replacement

Quote:
Originally Posted by Echofall View Post
Good tip, just be careful of the exhaust manifold
yeah gloves are recommended
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  #7  
Old 01-14-2013, 08:55 PM
zmister11 zmister11 is offline
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So if i have a bad o2 sensor in bank 2 itll be on the drivers side?
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  #8  
Old 01-15-2013, 07:32 AM
reconjb reconjb is offline
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Quote:
Originally Posted by zmister11 View Post
So if i have a bad o2 sensor in bank 2 itll be on the drivers side?
Yes
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  #9  
Old 01-15-2013, 08:36 AM
zmister11 zmister11 is offline
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Quote:
Originally Posted by reconjb

Yes
Okay i know that was an old thread, so thank you for replying
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  #10  
Old 05-06-2014, 12:34 PM
GirlsLoveTrucks GirlsLoveTrucks is offline
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Default Re: How-To: Oxygen Sensor replacement

My new (to me) '03 does not have a catalytic converter, how will that affect O2 sensors and OBD readings? (4.0L V6)
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Old 05-06-2014, 12:36 PM
djfllmn djfllmn is offline
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Quote:
Originally Posted by GirlsLoveTrucks View Post
My new (to me) '03 does not have a catalytic converter, how will that affect O2 sensors and OBD readings? (4.0L V6)
youll have a constant check engine light. It is also a federal crime to not have them
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  #12  
Old 05-06-2014, 01:01 PM
96_4x4_XLT 96_4x4_XLT is offline
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Quote:
Originally Posted by GirlsLoveTrucks View Post
My new (to me) '03 does not have a catalytic converter, how will that affect O2 sensors and OBD readings? (4.0L V6)
Bad mpg bad power
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  #13  
Old 05-06-2014, 01:06 PM
reconjb reconjb is offline
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Quote:
Originally Posted by 96_4x4_XLT View Post

Bad mpg bad power
I dont think it will affect power the rear o2 sensor only monitors it doesnt change trim levels
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  #14  
Old 05-06-2014, 04:16 PM
GirlsLoveTrucks GirlsLoveTrucks is offline
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Default Re: How-To: Oxygen Sensor replacement

Federal crime? In the US? I'm from Canada.
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  #15  
Old 05-06-2014, 07:22 PM
97rangerstepside 97rangerstepside is offline
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Default Re: How-To: Oxygen Sensor replacement

Quote:
Originally Posted by GirlsLoveTrucks View Post
Federal crime? In the US? I'm from Canada.
Look up the law where you live and see what it has to say about a catalytic converter.
Crawl underneath your truck to see if its came factory without a cat or if its been modified. The cat is usually located under the passenger side floor.
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