My car is constantly throwing DTC "522 - Rear O2 preheating" and "153 - Rear O2 sensor". I have cleared them 3x and they always return.
I read in following thread that front and rear HO2S are the exact same sensor for some Volvos.

http://www.brickboard.com/AWD/index.htm?id=1459996&show_all=1
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So I went to Bosch Auto Parts and used their vehicle part finder. They do not list a 1994 turbo 850, just 95 & 96. But the listed information leads me to believe the same is true for my car.

http://www.boschautoparts.com/VehiclePartFinder/Pages/VehiclePartFinderResults.aspx?MAKE=VOLVO&MODEL=850_TURBO&YEAR=1995&CAT=OxygenSensors
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My 94 is a VIN 7 engine and when I shop FCP Groton for the direct fit replacement, they list a Bosch part # 15062.

http://www.fcpgroton.com/product-exec/product_id/5529/nm/1994_1996_Volvo_850_Turbo_Bosch_Direct_Fit_REAR_Oxygen_Sensor/category_id/170
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I have a spare 94 turbo front HO2S in hand.
Can anyone confirm that I can splice the front sensor into the longer wiring harness for the rear sensor and get away with not having to buy a replacement?
If the answer is yes, do the two white wires (preheat) matter which way they are connected?

TIA, Al
--
Optimist - half full, Pessimist - half empty, Engineer - The capacity is twice what it needs to be.