Ok so I took my car to the auto parts store and read the codes, and it came up that my upstream O2 Sensor was bad. So I bought one it was like 80 bucks,....... btw im driving 99 s70 GLT. Anyways, I got under the car proceeded to remove the sensor, cut the wires, I was just going to splice the new on in rather than replace the whole harness, and come to find out the one i bought was 4 wires, white, white, grey, black, and the old one was 5 wires.. white, red, yellow, grey, black.... So... how do I make this 4 wire sensor work, I'm not trying to spend 340$ on the OEM upstream and another 300 on the OEM downstream. Any help would be greatly appreciated.

 

Sorry to say but you need to buy a BOSCH direct fit sensor.
http://www.fcpgroton.com/product-exe...ategory_id/170
Saves you $100.00

Volvo's hate spliced universal sensors.