i recently purchased an oxygen sensor for an 84 240 from fcpgrotons website. i received an oxygen sensor with one wire for its connection. i cant use it because i have two wires coming from my firewall for an oxygen sensor connection. i have no part number to go from because the car did not have an oxygen sensor when i purchased it. i can see that the exhaust manifold has a hole for the sensor to be installed in so i imagine its not the same part number as the sensor on my 1990 245 wagon because the wagons sensor is installed down by the converter. i can use any help you guys can give me because all the auto part shops in my area say the 84 240s use a single wire sensor. thats what they list but my car can not use it.

thanks in advance...................jorge santos