Originally Posted by craby

i put some 3 wire heated 02 sensors (25176708) in the car this week. so far it has helped and the car runs smoother at lower rpms. for 12v power i tapped into the ignition wire at the underhood fuse box so they only get power when the key is turned to the on position. used one 10 amp fuse for both sensors. i have them grounded at the block under the coil. there are two white wires and one black wire on the sensor. the black wire is for the 02 sensor (never touch to ground or power) and the two white wires are for power and ground, doesnt matter which you use for ground or power, i did however use the same (outside white on plug) wire on both for power. i soldered and sealed all the connections. you can use a 4 wire (94-02) and use only three of the wires on them like this http://shbox.com/1/heatedsensor2.jpg