Any Tips on changing my Oxygen sensors?

[Mr TCar]

My Dad and I will be changing all four this weekend on my 1995 Lincoln Town Car.Of course they are Original Equipment Bosch sensors that we just paid $200 for and I am renting the socket kit at Auto Zone.My car has 136,000 miles no problems just need to replace them as the interval is supposed to be 100,000 miles.
Where exactly are all 4 sensors? Does anyone have a diagram of where they would be in my car?Okay, I know there are two upstream and two downstream but where exactly? Any Tips on taking these 8 year old sensors out?
Warehouse Auto Parts( They are on the internet but I ordered them over the phone) was great for the new sensors, only $49.93 each!! Auto Zone has them for $69.99 a piece and they didn't even have 4 of them in stock in San Marcos!!
I got the sensors today and they look beautiful! They have some anti-sieze compound already on the threads but should I buy some more at Auto Zone? Or would Ii have conflicting chemistries and have an explosion. Just Kidding!!But seriously those conflicting chemistries might cause some sort of problem.

My cars Birthday is March 21, 1995 what's yours? It's birthdate is stamped into the metal under the trunk lid(not a sticker, really pressed in)

 

[VaderSS]

Are you sure the OEM is Bosch? I know that on Impala's the Bosch sensors don't do that well in comparison to GM.


Main tip I can give you is to do it while the exhaust is hot. Be careful, but it makes the old sensor easier to remove. Just use the anti-sieze on the sensor. It is a special conductive type that helps the sensor work properly. The only time you would need more is if you removed and replaced a sensor.

Also, the sensors downstream of the cats are tattletales, they do not effect the running of the engine, they only ensure that the cats are working, so if you are not getting a code, you do not need to replace them.

 

[Henrico]

I don't remember where I found this tip, but it has worked well for me. Heat up the exhaust and bung, either by running the car or with a propane torch. I prefer using a torch as this makes the chance of burning oneself much smaller. After you get the parts good and hot, ice down the sensor, paying particular attention to the fitting. Don't cool down the exhaust or bung. The heat will expand the bung opening and the ice will contract the sensor. Sensor pops right out!

H.

 

[cousincletus]

I have replaced these before as preventive maintenance, and had no problem getting them out. They are coated with antisieze from the factory. You don't need to put any more antisieze on the new one.