The Audi A4’s engine lineup centers on a 2.0-liter turbocharged four-cylinder gasoline engine as the most common option, with additional diesel variants, a plug-in hybrid, and a higher-performance S4 model that uses a different, larger engine. Availability varies by market and model year.
Overview of the current engine lineup
The following describes the main engine configurations you’re likely to encounter in recent Audi A4 models. Market-specific choices can differ, especially outside Europe and North America.
Gasoline engines
Gasoline options are the backbone of the A4 lineup. These typically include a turbocharged four-cylinder with optional mild-hybrid assistance on many trims, plus the high-performance variant that uses a larger V6.
- 2.0-liter turbocharged four-cylinder TFSI: the standard choice in most A4 models, offering strong performance and efficiency in everyday driving.
- 2.0-liter TFSI with 48V mild-hybrid system: an upgraded version designed to improve efficiency and smoother operation on many trims.
- 3.0-liter turbocharged V6 TFSI (S4): the performance option, delivering markedly higher power for the sport-oriented S4 variant.
In practice, most buyers will start with the 2.0-liter gasoline engine, with the 3.0-liter V6 reserved for the sportier S4 and its variants.
Diesel engines
Several markets offer efficient diesel options aimed at long-distance driving and high-mileage use, typically based on a 2.0-liter TDI design with multiple power outputs.
- 2.0-liter TDI diesel: available in several tunes that range across light to strong torque for everyday commuting and relaxed highway cruising.
Diesel availability varies by country due to emissions regulations and market demand.
Plug-in hybrid
A plug-in hybrid variant combines the gasoline engine with electric assist to boost efficiency and offer electric-only driving for shorter trips.
- 55 TFSI e plug-in hybrid: pairs a 2.0-liter TFSI with an electric motor for a combined output that competes with performance models while delivering the ability to drive on electric power for shorter hops. WLTP electric range is typically on the order of a few dozen miles depending on the configuration.
The plug-in variant is designed for buyers seeking lower real-world fuel consumption and the option of driving short distances without using gasoline.
Notes on the S4 and market variations
The A4’s S4 variant represents the top end of the lineup with its own engine characteristics, while other trims share the 2.0T or diesel options. Engine availability and specifications can differ by region and model year, with some markets offering additional tuning or battery-assisted features as part of mild-hybrid systems.
Why the engine choice matters
Choosing an engine affects performance, fuel economy, and drivetrain characteristics (such as front-wheel drive versus quattro all-wheel drive). If you frequently drive long distances, diesel options may offer better fuel economy. If you want quick acceleration and sporty feel, the S4’s V6 delivers the most power. For city driving and short commutes, the plug-in hybrid can reduce gasoline use when you routinely recharge.
Summary
Across model years, the Audi A4 primarily uses a 2.0-liter turbocharged gasoline engine, with diesel variants and a plug-in hybrid available in many markets. The high-performance S4 uses a 3.0-liter turbocharged V6, and engine availability varies by region and year. In short, the A4 offers a range of powertrains designed to balance efficiency and performance, with the most common choice being the 2.0L TFSI family plus optional electrified and more powerful variants.
Summary: The A4’s engine lineup is broad but anchored by a 2.0L turbocharged four-cylinder, with diesel options, a plug-in hybrid, and the S4’s V6 for enthusiasts. Market differences mean exact specs can vary, so checking the specific model year and trim for your region is recommended.