2021 Audi Q4 e-tron S Line prices

There are 24 used 2021 Audi Q4 e-tron S Line cars for sale from UK dealers on AskCar, as of 8 November 2026. Typical asking price £20,000 (the median: half cost less, half cost more). The cheapest is £2,000. The middle half are priced between £17,900 and £21,000. Median mileage: about 39,000 miles.

Dealers lowered the asking price on more than one in five of 2021 Audi Q4 e-tron S Line cars: 6 of the 24 in the 14 days to 8 November 2026.

2021 Audi Q4 e-tron S Line against other years

A 2022 Audi Q4 e-tron S Line car has a typical asking price of £21,500, as of 8 November 2026.

AskCar lists 1,264 used Audi Q4 e-tron across the UK, from 383 dealerships.

As of 8 November 2026, AskCar lists 595,629 cars and vans from 12,891 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

2021 Audi Q4 e-tron S Line cars for sale now, page 1 of 2

This page picks out up to 10 cars in each of these groups: best value, cheapest, lowest mileage, recently reduced and newly advertised. A car in more than one group is listed in full once. The groups pick only from cars with photos and an AskCar estimate, priced at £500 or more and no more than 25% under that estimate. 22 of the 23 cars listed here meet these rules. Page 2 lists every other 2021 Audi Q4 e-tron S Line car, cheapest first, including the one the groups do not pick from.

The AskCar estimate is our expected asking price for that one car, from its model, age, mileage and specification, using the 1,259 priced Audi Q4 e-tron adverts on AskCar as of 8 November 2026. The figures on this page describe the cars advertised, not a valuation of every 2021 Audi Q4 e-tron S Line.

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. Each car's AskCar page has its full price history and cheaper cars like it.

This list leaves out 1 car whose advertised mileage is lower than the mileage recorded at its last MOT test.

Best value 2021 Audi Q4 e-tron S Line: priced furthest below the AskCar estimate

These 10 are priced 1% to 6% under their AskCar estimate. Their asking prices run from £17,990 to £21,990.

Cheapest 2021 Audi Q4 e-tron S Line: the lowest asking prices

These 10 are priced £15,149 to £19,750. They have covered 21,542 to 94,726 miles.

Lowest-mileage 2021 Audi Q4 e-tron S Line

These 10 have covered 14,567 to 32,609 miles. Their asking prices run from £18,798 to £23,400.

Recently reduced 2021 Audi Q4 e-tron S Line: the biggest price reductions in the 14 days to 8 November 2026

The dealer lowered the asking price on each of these 6 in the 14 days to 8 November 2026. Their reductions since AskCar first saw them run from £151 to £1,442.

Newly advertised 2021 Audi Q4 e-tron S Line: first seen by AskCar in the 7 days to 8 November 2026

These 3 are the most recently advertised. Cars first seen on the same day are listed cheapest first.

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