Used diesel Mercedes-Benz C Class for sale under £20,000

There are 2,087 used diesel Mercedes-Benz C Class under £20,000 for sale from UK dealers on AskCar, as of 31 October 2026. Typical asking price £12,000 (the median: half cost less, half cost more). The cheapest is £990. AskCar lists 4,731 used Mercedes-Benz C Class across the UK, from 2,258 dealerships.

The middle half of the 2,087 cars are priced between £8,000 and £15,000.

As of 31 October 2026, AskCar lists 583,548 cars and vans from 12,716 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

543 of the 2,087 cars had their price reduced in the last 14 days to 31 October 2026.

Median asking price by year

YearFor sale with a priceMedian asking priceMiddle half priced between
202132£18,200£16,300 to £19,100
2020112£17,000£15,400 to £18,500
2019268£15,500£13,300 to £17,000
2018275£14,100£12,000 to £16,000
2017405£13,000£11,300 to £15,000
2016282£11,500£9,700 to £13,500
2015222£8,500£7,000 to £10,000
2014179£7,800£6,200 to £9,400
201379£5,200£4,500 to £6,100
201291£4,800£4,000 to £5,700
201141£4,300£3,700 to £4,700
201023£3,300£2,800 to £4,200
200923£3,500£2,900 to £4,000

Cars for sale now, page 15 of 21

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 4,532 priced Mercedes-Benz C Class adverts on AskCar as of 31 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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