I had a non-OEM towbar fitted to my previous 2018 V90, I had a fixed swan-neck Thule bar and PF Jones dedicated wiring harness, total cost was around £350 PLUS £150 fitting. HOWEVER. even with it being a plug-in harness I was advised that Volvo couldn't "code" the car to use the various built in software (lamp check etc) AND the fitter connected the fog light delete function to the fuel gauge (apparently the wires are the same colour) so when the trailer lights were plugged in the fuel gauge stopped working.
All got sorted but for my current 2022 V90 I had a genuine Volvo system installed, more expensive but everything works just as it should.
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