The 2018 Audi S4 is a compact luxury sport sedan that blends everyday comfort with serious performance, making it ideal for drivers who want a quick, refined daily commuter with all-weather capability. It’s part of the B9 generation (redesigned for 2017), which brought a modernized interior, updated tech, and a new turbocharged V6. In the market, the S4 sits above the A4 as the performance-focused choice, competing with cars like the BMW M340i (later years) and Mercedes-AMG C43. For 2018, it remains a sweet spot for buyers who want a fast, understated sedan without moving up to a larger S6.

1) Turbocharged V6 performance: The 2018 S4 uses a 3.0L turbocharged V6 (TFSI) rated at 354 horsepower and 369 lb-ft of torque, delivering strong midrange pull and quick passing power. 2) Quattro all-wheel drive: Audi’s quattro system is a major draw for the S4, providing confident traction in rain and snow and helping put power down cleanly when accelerating hard. 3) 8-speed automatic transmission: A quick-shifting 8-speed Tiptronic automatic is standard for 2018, tuned for both smooth daily driving and sharper response in Dynamic mode. 4) Sport-focused chassis and braking: The S4 includes sport suspension tuning and stronger braking hardware than the A4, giving it a more planted feel through corners. 5) Upscale cabin and tech: Expect premium materials, available virtual cockpit digital gauges, and a well-insulated interior that keeps the S4 comfortable and quiet when you’re not pushing it.

Shoppers searching “2018 Audi S4 problems” or “2018 Audi S4 common issues” will find that the B9 S4 is generally solid for a performance luxury sedan, but it still has a few patterns worth knowing. 1) Water pump/thermostat housing leaks: Like many modern Audi/VW turbo engines, some owners report coolant loss or seepage from the water pump or thermostat housing area. This can show up anywhere from around 30,000 to 70,000 miles, often as a low coolant warning or a sweet coolant smell after driving. 2) PCV system and oil consumption concerns: A failing or weak PCV (positive crankcase ventilation) component can contribute to rough idle, whistle noises, or increased oil usage. Not every S4 has oil consumption issues, but checking oil level habits and service records is important, especially as mileage climbs past 50,000 miles. 3) Carbon buildup on intake valves: The 3.0T is direct-injected, and over time some engines develop intake valve carbon deposits that can cause hesitation, reduced efficiency, or a slight misfire at idle. This tends to be more noticeable as mileage approaches 60,000–90,000 miles depending on driving style and maintenance. 4) Electronics and sensor glitches: Owners occasionally mention infotainment bugs, backup camera inconsistencies, parking sensor faults, or intermittent warning lights. These issues are often software-related, but diagnosing them properly matters because some faults are caused by sensors or wiring rather than the head unit itself.