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Old 05-05-2012, 12:58 PM   #1
auxmike
 
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Drives: 2008 HB, A/T, Power W/L/M
Join Date: Oct 2008
Location: LI, New Yawk
Posts: 2,063
DIY : changing the Oxygen / O2 sensor on Yaris hatch MANY PICS

This is just a pictorial of what you will see and what I used to do the job. Do this at your own risk! You can get burned and really screw up your car trying to remove these parts. If you get stuck, you may need to hire a mechanic to to fix your mess, $$$.
I was able to successfully change out both my AF Sensor and the lower oxygen/O2 sensor. I learned real fast that doing this with cold pipes is futile. Upon running the car and getting things hot the job moved quickly.
I started by trying to remove the lower sensor with a cold exhaust and it turned about half a turn even using a large pipe wrench AND a floor jack to push up on the darn wrench! It would not turn.Period. I tried again the next night with a hot exhaust and spraying some WD40 on the point where the sensor meets the threaded bung. I rocked the tool back and fourth as I got it to start turning while continuing with little shots of the WD40. It was SO much easier with a hot pipe! There are pics showing how bad the threads were stripped on that lower sensor, damage from working with a cold pipe and almost snapping off the sensor... The sensors connector plug is INSIDE the car, you will need to remove the center consol to unplug it and feed the new wires in.
The top one was done using the same technique. That one was EASY. I only needed a 3/8 drive ratchet with the shorter cast steel tool to crack it loose. After hearing how members trying to remove these top units were unable to, I wonder if they used heat to open up the threads first, or if I got REAL lucky taking the risk getting it out without hiring a mechanic.
There's a black metal plate that's bolted onto the engine just above the axel boot. Remove the nut from the right side and the bolt from the left side using a 12mm dep socket. I used a 1/4 drive no problem. If you don't remove this plate first don't bother attempting the job.
I've added many pics. Some show a few variations of tools you can use to turn that stubborn sensor. Having them all lets you switch between them as needed. WD40 is a lot better than it gets credit for. After I started the car there was some smoke coming off the pipes as the lubricant burn off.
I was super happy with the results!
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