The AUDI A4 (2001-05) 4DR SALOON 2.5 TDI 163 SE is a mid-sized, four-door diesel saloon, aimed at buyers wanting a comfortable, more upmarket alternative to mainstream family cars. In the UK used-car market, it sits alongside the BMW 3 Series and Mercedes-Benz C-Class, offering understated styling and everyday practicality. With its strong diesel engine and SE trim, this A4 is suited to commuting, longer motorway journeys and small-family duties, especially for drivers who value a composed ride and useful boot space. It has a more restrained feel than some rivals, while its traditional saloon shape and Audi cabin finish remain appealing; age and condition matter greatly when assessing any example. Mycarcheck.com recorded 18 look-ups across 10 distinct VINs, a modest sample. Those checks show average recorded mileage of 101,000, annual use of 9,000 miles and about 4.4 previous keepers; average private-sale valuation was £400, a snapshot, not a guaranteed price.