The AUDI A4 (2001-05) 4DR SALOON 1.8T 190 QUATTRO S LINE 6SPD is a compact executive saloon: a four-door alternative to family hatchbacks, sitting in the UK used market alongside BMW 3 Series and Mercedes-Benz C-Class models. Its smart, understated shape and S line styling give it a sportier presence than a standard A4. Mycarcheck.com has recorded 148 checks across 69 different VINs, giving a useful snapshot of interest in this older model. Checked examples average 129,000 miles and nearly five previous keepers; average annual mileage is 4,000. The average private-sale valuation is £400, so condition and history deserve particular care when comparing cars. The turbocharged petrol engine offers brisk performance, while quattro four-wheel drive can help provide reassuring grip in poor weather; expect running costs to reflect performance and age rather than modern-car thrift. This A4 suits drivers wanting a comfortable commuter or smaller-family car with a confident, enjoyable feel.