have 96 es300.

check engine lit up so I scanned it and got P0135.

It's O2 sensor (bank 1 sensor 1) that I have to replace.

I research about this on this forum and I found out that it is located at back

of the engine.

Is there anybody took some pictures while you were working on it?

Which maker should I go with? and how can I reach at o2 sensor in the back?

is there any special tool that I must have before doing it?

Please help! thanks a lot!