The 2002 Audi S4 is a compact luxury performance sedan (also sold as an Avant wagon) that blends understated looks with serious turbocharged power and all-weather quattro traction. It’s part of the B5-generation S4 (1999–2002), known for its tunable twin-turbo V6 and upscale interior feel for the era. This model is ideal for drivers who want a refined daily driver that can still feel quick and engaging on back roads. In the used market, it’s a performance bargain on purchase price, but it rewards buyers who budget for proactive maintenance.

- 2.7-liter twin-turbocharged V6 (often referred to as the 2.7T), rated around 250 hp and 258 lb-ft of torque, delivering strong midrange pull and easy highway passing power. - quattro all-wheel drive for confident traction in rain and snow, plus a planted, secure feel at speed. - Choice of a 6-speed manual transmission (most sought-after by enthusiasts) or a 5-speed automatic, depending on build. - Sport-tuned suspension and larger brakes than the A4, giving the S4 sharper handling and more consistent stopping power. - Premium cabin features typical of Audi’s early-2000s lineup, including supportive sport seating and a solid, quiet ride that still feels upscale today.

Shoppers often search “2002 Audi S4 reliability” and “2002 Audi S4 common issues” because the B5 S4 can be excellent when maintained, but expensive when neglected. Here are common problem areas reported by many owners: - Turbocharger wear or failure: The stock K03 turbos can wear over time, especially on tuned cars or those with hard driving and infrequent oil changes. Symptoms include smoke, loss of boost, and whining noises. Failures are often reported anywhere from about 80,000 to 150,000 miles, though some last longer with careful upkeep. - Timing belt service and related components: The 2.7T is timing-belt driven, and overdue service can be catastrophic. It’s not just the belt—tensioners, idlers, and water pump should be replaced together. Many owners plan this service around 60,000–90,000 miles depending on parts quality and history. - Vacuum/boost leaks and aging hoses: Cracked vacuum lines, diverter valve issues, and boost leaks can cause rough idle, poor fuel economy, and underboost/overboost conditions. These issues are common as rubber and plastic components age, often becoming noticeable after 100,000 miles. - Control arms and front suspension wear: The multi-link front suspension delivers good ride and handling but uses multiple bushings and ball joints. Clunks, vibration, uneven tire wear, and wandering steering are common complaints as parts wear, sometimes starting around 70,000–120,000 miles depending on roads and driving style.