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It is a security feature. There is a trip wire in the side panel on the wagon (interior), and in the trunk on the sedan. That will get it open. You can also disconnect the battery for a few minutes, then reconnect, and lock and unlock the car with the key and it should re-set. The release wire information is in the manual, keep looking.
with the little research i've done including looking up the part. which only lists one being before the catyilitic converter (uptream) and the fact that your car being 1994 with obd I emission controls (obd II reqiures two - 1 upstream and 1 downsteam), i'm making an educated guess that it only has one O2 sensor
Volvo has had a lot of trouble with ABS control units. Yours will most likely need to be replaced. You can either replace it with an exchange unit from a Volvo parts supplier or send yours to BBA reman. in MA for repair.
There are actually two gears that you need to replace, a large one and then smaller one that rides inside it. You can purchase them both at www.fcpgroton.com These can also sometimes affect the operation of your speedometer. Do you by chance have an ABS and TRACS light on? If so the speedometer issue may be related to your ABS controller.