"i remember visiting this site once sometime ago.there was an on going discussion about the pros and cons of hooking up an early,single wire 02-sensor on a 1989 240 B-230 non turbo automatic.i want to do this,(i think?)
what to do with the wires to make this work? "

The wires to make this work. 2 of the wires are for the heater, so you just leave those alone and hook up the single wire to the 02 feed to the computer.

"what problems might i encounter?
climate-(midwest)
reason for wanting to do this -(cost of preheated sensor)
thanks for any and all help "

When is the last time u bought an 02 sensor? how much does the 3 wire one run?
Have you checked all the options? www.alloemvolvoparts.com www.fcpgroton.com

I am thinking of converting to a heat 02 sensor, sure it might be more expensive, but it heats up the sensor much faster, and the computer goes into closed loop mode using the feedback from that, which helps gas mileage and driveability.

Especially where you are, I would use a heated 02 sensor since the winters are much colder, and getting the sensor to operating temperature is best in my opinion.

just some thoughts, hope it helps.

take care

Luke
82 242Ti 169k miles
http://home.ncn.com/~pcguy