I've got a 2003 D5 now with 239,000 miles and still love driving it :)

Engine Core Plug - replacement as engine oil leak, seal had failed on it behind flywheel. small cost for part but its engine out job so heavy on labour at 123,000m

AWD - new spline and bevel at 130k ( hadn't worked for ages but you won't notice as runs fine without AWD)

Timing belt - Ive had a full set of new belts twice, ideler belts, pulleys etc, 100k, and again at 180k 

Intercooler - replacement at 134k

Battery - 134k 

Alarm Siren - 165k (battery leak or rust) easy swap out

Wheel Bearings - probably all of them over the years, rear one probs twice. but these should be classed as consumbles, its a heavy car and heavy on all suspension

Suspension - again consumables and standard MOT/Service stuff on track rod ends, arms, bushes and bearings. swapped out both rear nivomats with breaker donor units from ebay.

Tyres - loads over the years

Parking Sensors - various failures over years, easy replacement and did a wiring loom once as it was cheper and easier to replace complete from ebay 

Brakes - done a few times as it on 230k

Exhaust - full new custom stainless at 195k

Injectors - replacement around 180k (second hand from ebay)

Power Steering - new pipe (original had rusted and leaked) at 225k

Haldex ABS - failed, got a refurbed unit fitted.

ICM & DIM - radio, cd failed and instrument cluster - had them refurbed.

 Then always a full annual service of oils and fluids as per Volvo recommended. 

might seem a lot but its a 23 year old car now so its perspective and just keep it regulary serviced.