As no one has replied, I'll give you an alternative thought that might be totally off base, if so, sorry.
You say you have a headlight issue, I had a issue on a P2 V70 2004AWD. The issue was the rear level sensor. Unless the "rear axle sensor" is only on P3 AWD I believe we could be talking the same thing.
Attached are two pics to help you locate the "sensor" I replaced.
You may have two sensors as the AWD R V70/S60 had or only one - as the other models in the v70 P2 range had.
Both images are looking towards the front of the car.
Good luck
Cheers
Bob
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