it will most definately *NOT* have two wires going to it. either it will have 1 wire if it is obd0, or it will have 4 wires if it is OBDI+.
The extra wires in the OBDI setup are for heated O2 sensor, which OBD0 does not have, hence the reason why OBD0 o2 sensors are located up very close to the head ports on the exhaust manifold, and OBDI setups have the 4 wire o2 sensor located on the collector flange since its heated, it doesnt need to use the heat from the exhaust to heat it up like OBD0.