Hopefully I can clear up some confusion on 240 ABS - maybe... or maybe add to it...:)
91 was the first year 240's had ABS. Yes, I believe it was a midyear option. It was standard on 92 and 93's. All 240's were OBD1. Meaning all the socket holes dedicated to ABS were empty as Dave mentioned. OBD2 is required to get ABS trouble codes. As you noted, if the ABS light is on it is usually due to grime or rust on the sensors.
As suggested, check your ABS wiring and grounds. Perhaps it is something simple like that?
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Will I buy another Volvo??? We'll see....
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