Anyone know how to replace a a bank 2 (left) upstream oxygen sensor. Its very tight. Any links to a DIY?

 

That's the easy one to get to ;o))
If you use the proper O2 sensor removal sockets...the ones witht he side bit cut out which allows the wires to go through without damage....after it has been unplugged of course....use the socket with an offset extension .
Well lube the O2 sensor beforehand with plenty of penertrant...let it soak for an hour, fit the sensor socket in such a position as to give plenty of purchase
With your extension and ratchet handle pointing towards the right fender/guard....grab it and give it a good shove forward....you should hear it crack as it breaks free and wind out.
When replacing, use a small dab of nickel ant-seize...just enough to LIGHTLY
coat bottom half of threads and torque up at 25lbs and reconect the plug.
Start engine and let idle for 10 mins.
The engine revs should settle back to normal idle after initial cold start fast idle which should cut back after about a minute depending on ambient temp.

 

Twist, stretch, ouch, push, turn, groan, pull. Hope that helps! Cuss words optional!

 

I think it may be easy in Australia because your right hand drive. How do you get your right side off? Its super tight on the left here.

 

Looking from the drivers seat....the left side is a pain, the right side is the easy one ;o)
On the left (LHD), it makes life a bit easier to remove a few things starting with the coolant expansion tank.
Yours may still have the exhaust shield at the top of the catalyst which may need removing.
getting the sensor plugs removed is a bit of a fiddle but try not to damage them.
Once you've made a bit of swinging room, same appliesa sfor left ;o]
It's much easier to rejoin the plugs before fitting them back onto the bracket.

 

Replacing it?
If you are without the special socket for this cut the damn wires and put a(6pt.!)socket or box wrench on it. 22mm, 7/8" will do too.

 

If you do a search -- this has been discussed.

I removed the coolant tank -- very easy after you suck out some of the fluid. You then have to move the heat shield out of the way.

I ordered the O2 sensor from Amazon -- and ordered a couple of tools at the same time. The O2 socket with the handle attached worked the best for me.

spray the old socket with some sort of penetrating oil -- and let it sit for a while.

It took me longer to move and replace the heat shield then removing the sensor

 

ahhhh ... but someone said a few months ago, and i forget if it is for the upper or lower ...

if you remove the drain hose for the a/c evaporator it is a direct shot with an extension and socket

penetrant still recommended