Used diesel BMW X3 for sale under £20,000

There are 761 used diesel BMW X3 under £20,000 for sale from UK dealers on AskCar, as of 30 October 2026. Typical asking price £13,500 (the median: half cost less, half cost more). The cheapest is £1,695. AskCar lists 3,047 used BMW X3 across the UK, from 1,191 dealerships.

The middle half of the 761 cars are priced between £9,500 and £17,600.

As of 30 October 2026, AskCar lists 580,490 cars and vans from 12,695 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

251 of the 761 cars had their price reduced in the last 14 days to 30 October 2026.

Median asking price by year

YearFor sale with a priceMedian asking priceMiddle half priced between
2019136£18,400£17,300 to £19,500
201896£18,000£16,000 to £19,000
2017106£14,000£12,500 to £15,800
2016137£12,200£11,000 to £14,500
201581£10,500£8,500 to £12,000
201467£8,900£7,000 to £10,900
201345£7,000£6,000 to £8,800
201230£7,000£5,100 to £8,100
201122£6,000£4,500 to £6,500

Cars for sale now, page 7 of 8

Best value first: the cars priced furthest below their AskCar estimate come first, and those without one come after. The AskCar estimate is our expected asking price for that one car, from its model, age, mileage and specification, using the 2,993 priced BMW X3 adverts on AskCar as of 30 October 2026.

Each car: year, make, model, engine and trim, power, gearbox, fuel, body, doors, colour; mileage; price and its changes; how the price compares with the AskCar estimate; emissions standard and ULEZ compliance where it holds; MOT; dealer and town; AskCar page.

Cheaper cars like each one, with its price history, are on its AskCar page.

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