Sometimes its enough to change a bulb.
Itbis possible not to push the bulb fully in into its seat, and therefore it will sit at wrong angle.
But also- bulbs are made to certain tolerances.
The coil inside will sit slightly differently in each bulb, even a pair from the same box will have these at different position.
Easy to check- just go to your nearest place that sells car bulbs, grab a box ir two (preferably clear plastic box, but that's most of them anyway) and have a close look.
Absolutely enough to throw the lights settings off.
And therefore it makes sense to at least check your beams elevation against a wall after each bulb change..
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`03 V70 Mk2 Auto 2.4 B5244 NA, 170Bhp, 295K miles
(Now parts donor)
'05 XC70 MK2 Geartronic, 2.5 B5254T2, 210bhp, 129k miles
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