The AUDI A4 (2001-05) 4DR SALOON 2.5 TDI 163 SPORT MTRON AUTO is a mid-sized executive saloon: a traditional four-door choice rather than a hatchback or SUV. In the UK used-car market, it sits among premium family and business cars, competing with BMW 3 Series and Mercedes-Benz C-Class models. Its smart, understated styling still feels suitably upmarket. Mycarcheck.com has recorded 14 look-ups covering eight distinct cars, so its figures offer a useful snapshot, not a broad reliability verdict. The recorded cars average 154,000 miles, around 7,000 miles a year, and 7.5 previous keepers. Average private-sale valuation is £300, suggesting age and condition are crucial. This diesel saloon suits commuters, business users and families seeking comfort, with an automatic gearbox helping in traffic. Its 2.5-litre V6 diesel and Sport trim offer a distinctive character, while refinement and cabin quality are class strengths. Check service history and condition carefully on older examples.