It is incredibly easy to do this repair on your own and should be done every 100k miles.  It can be done in 10 min with minimum mechanical know how or experience.  By doing the job yourself you can save yourself about $200.  In this instructable, I will walk you threw the steps and  I will also give you a AC Delco part number for a cheaper O2 sensor than the one you get at the local part store for $160.  Its the very same sensor, just $110 cheaper.

Step 1: Materials

Ok, lets get down to business.  Here is what your going to need.

1. A 05 Saturn VUE 
2. O2 sensor AC Delco Part # 1255-8143 (I got mine from Ebay for $50 new)
3. O2 sensor socket. ($10 from Advanced Auto Parts)
4. 3/8 drive ratchet.  
5. 10 min of your time.

(Note:  In the picture I am showing the old O2 sensor that came out of the vehicle.  I had already replaced it just prior to doing this instructable.)

<p>dumb question,is t easier to get it out from the top down or the bottom up?</p>
I was able to get to mine from the top down. I'm fairly tall and didn't have any problem reaching around the back side of the engine though.
<p>Good Instructable...just a couple of things to add. There is another O2 sensor down by the Catalytic converter. Both can be very difficult to remove, and are easier to remove when the engine is hot...or if you are careful with a propane torch heat up the metal around the sensor (expanding it) and it makes the sensor screw out easier.</p><p>DO NOT USE a flammable solvent like liquid wrench or WD40...especially on the one by the cat.</p><p>The O2 Socket can often be borrowed/checked out at an AutoZone...I hate buying tools that I'll use once, then loose before I need it again at 200,000 miles.</p>
Just want to add something this this instructable can also be applied to all cars: On Some cars Be careful about which O2 Sensor you actually buy. Some Cars Dont like the OEM ones you get at auto zone, in which Case you would have to get the dealer part. Researching first about your specific car will help you in the long term :). <br> <br>Also, if the O2 sensor is bad a code is usually thrown on ODB 2 Cars, BUT Sometimes this will happen if you have an exhaust leak After the Cat. <br>
Err, Before the Cat. After the Cat usually isnt a problem.

About This Instructable




Bio: I have an Associates degree in Applied science with a Major in Industrial Electrical Maintenance. I have been a Industrial mechanic and Electrician for 10 ... More »
More by jgregory83:How to replace the O2 sensor on a 2005 Saturn VUE 2.2 L 
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