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In 2.8 Pajero the speedo receive electronic signal from the VSS sensor, but if the speedo for any reason stop working, O/D will stop work because the Trans ECU needs signal from the speedometer electronics to made the gear change into O/D
What is happening is the tranny is going. They can try to replace the selenoid, but really, you need a rebuild. Whomever charged you to remove the light, probably messed things up more. Volvo's typically lose overdrive before losing all the other gears. It is time for a rebuild. Go to a reputable tranny shop who knows volvos.
ok one thing to do is scan codes to see which sensor is not reading. then go to it with a scanner hooked up. youre gonna be able to see live moh parameters or windows to see live data anyhow access the rear which isnt working. jack up truck safely put in drive then proceed tothe rear sensor wire. u can do this at any sensor that isnt reading. u then look at the mph window in scan tool an watch it while u wiggle the affected sensor wire goin to the harness. watch for jumps an droputs of the mph parameter while wiggling sensor wires from sensor all the way to the harness. thats how its done looking for broken wires. food luck hope this helps