I recently purchased 2 NTK o2 sensors from ebay.

I purchased a 3 wire o2 sensor for the front right. Replaced it, and it worked fine. all the wires matched. 2 whites and 1 black...

I remove the rear o2 sensor and turns out that the rear o2 sensor is actually 3 wires instead of 4 wires which it says everywhere else...
the stock rear o2 sensor has 3 wires colored Red, White, & Black...

thats weird... i searched everywhere and all posts said that the rear o2 on the 95 is a 4 wire...so i ordered 4 wire (Black, White, White, & Grey)... and its not 4 wires... its 3!!!!!

whats with the Red, Black & White wires in the stock rear o2 sensor...
does any one have a chart for what these wires on the stock o2 mean?

y's that even there... i thought it was a 4 wire... even according to people selling OEM o2 sensor are selling 4 wire o2 sensors for the cat.....

 

For the 95 the post-cat sensor is definitely a 3-wire. Just go to oxygensensors.com and find the oem replacement by entering your car info.

 

never mind... i found the answer... the rear o2 sensor is called the Titania version... different length and wire colors...