The Bendix/Siemens fuel sytem models use a different type sensor and it is not interchangeable with the Bosch units. This sensor does not work with a .5 V reference out of the ECM as does the Bosch versions. This type uses the heater power supply to feed a sensor circuit responds to O2 level variations. The Bosch type employs an electrochemical reaction and the heater is for stability of the temp (and therefore the signal) and not for the supply of current to be modified and used as output signal.
http://216.239.41.104/search?q=cache:4t_ja5f8dCIJ:www.volvoclub.org.uk/faq/EngineSensors.html+volvo+bendix+regina&hl=en-----this is the link



i found the above statement in the faqs. the reference voltage is what bosch uses to determine return voltage to the ecu. will keep looking. no, i don't speak french. the bendix system was introduced on the 74o gl-cheap car, manual windows, no sunroof, etc-in 88. the bendix sytem is cheaper to buy than the bosch. and so it goes, chuck.