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

There are 2,180 used diesel Mercedes-Benz C Class under £20,000 for sale from UK dealers on AskCar, as of 29 October 2026. Typical asking price £11,800 (the median: half cost less, half cost more). The cheapest is £990. AskCar lists 4,876 used Mercedes-Benz C Class across the UK, from 2,356 dealerships.

The middle half of the 2,180 cars are priced between £8,000 and £15,000.

As of 29 October 2026, AskCar lists 587,923 cars and vans from 12,992 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

542 of the 2,180 cars had their price reduced in the last 14 days to 29 October 2026.

Median asking price by year

YearFor sale with a priceMedian asking priceMiddle half priced between
202132£18,200£16,400 to £19,100
2020111£17,000£15,400 to £18,300
2019277£15,500£13,500 to £17,000
2018290£14,000£12,000 to £16,000
2017421£13,000£11,000 to £15,000
2016301£11,500£9,500 to £13,500
2015233£8,500£7,000 to £10,300
2014185£8,000£6,000 to £9,300
201381£5,200£4,500 to £6,500
201293£4,800£4,000 to £5,500
201148£4,200£3,500 to £4,700
201023£3,300£2,800 to £4,200
200924£3,600£2,900 to £4,000

Cars for sale now, page 2 of 22

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 4,525 priced Mercedes-Benz C Class adverts on AskCar as of 29 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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Mercedes-Benz C Class by gearbox, fuel and body

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