Audi A4 B9 Avant engines

Since its market launch in 2015, the Audi A4 B9 Avant has established itself as a premium estate in the upper mid-size class and offers a technically mature engine range with advanced technologies. Over two generations, the Audi A4 B9 Avant engine range has evolved from proven TFSI and TDI engines to electrified mild hybrid systems that optimally combine efficiency and performance.

Audi A4 B9 Avant engines (2015-2019)

The first generation of the Audi A4 B9 Avant marked a significant technological leap compared to its predecessor, the B8, and established new standards in terms of efficiency and driving comfort. Mileage expectations were between 250,000 and 350,000 kilometers with proper maintenance, whereby the proven 2.0 TDI diesels were particularly durable and often reached 400,000 kilometers without any problems. Major repairs were typically only due after 150,000 to 200,000 kilometers, mainly to the turbocharger or injection system. The absolute top engine of this generation was the 3.0 TDI with 272 hp, which was both powerful and reliable thanks to its V6 configuration and bi-turbo charging. Technically, this generation was characterized by the introduction of the MLB platform, which enabled weight savings of up to 120 kg and thus improved the efficiency of all engines.

Audi A4 B9 Avant petrol engines (2015-2019)

The Audi A4 B9 Avant TFSI range started with the 1.4 TFSI as an entry-level engine with 110 kW (150 PS), which impressed with cylinder deactivation (COD) and turbocharging. This engine proved to be particularly economical and reliable, with only occasional problems with valve coking after high mileage. The 2.0 TFSI was available in various output levels from 140 kW (190 PS) to 185 kW (252 PS) and used the proven third-generation EA888 technology. While the weaker variants ran quite smoothly, the powerful 2.0 TFSI engines occasionally showed increased oil consumption and turbocharger wear during sporty driving. The top engine was the 3.0 TFSI V6 with 200 kW (272 hp) and later 260 kW (354 hp) in the S4 Avant, which offered smooth power delivery thanks to its supercharging, but was more maintenance-intensive.

Audi A4 B9 Avant diesel engines (2015-2019)

The Audi A4 B9 Avant TDI engines were dominated by the 2.0 TDI in various output levels from 110 kW (150 PS) to 140 kW (190 PS). All variants had common-rail injection and SCR catalytic converters for exhaust gas aftertreatment. The 2.0 TDI with 110 kW (150 PS) developed into the most reliable engine of the entire generation and offered an excellent compromise between performance and consumption of just 4.2-4.8 liters per 100 km. Problems were mainly caused by neglected maintenance, in particular clogged particulate filters or defective EGR valves. The top diesel was the 3.0 TDI V6 with 160 kW (218 hp) to 200 kW (272 hp), which impressed with its bi-turbo configuration and ran very smoothly despite its high output.

Audi A4 B9 Avant engines (2019-2024)

The 2019 facelift for the Audi A4 B9 Avant saw a fundamental overhaul of the engine range, with mild hybrid technology being used across the board for the first time. Mileage expectations rose to between 300,000 and 450,000 kilometers, as the 12-volt mild hybrid systems relieve the combustion engines and reduce their wear. Damage to the engine became a rarity, with major problems only occurring if maintenance intervals were extremely neglected. The outstanding engine of this generation was the 2.0 TDI with 150 hp and mild hybrid support, which perfectly combined reliability, economy and sufficient power. Technically, the 48-volt electrical system revolutionized efficiency, while at the same time all engines were Euro 6d-temp compliant and therefore future-proof.

Audi A4 B9 Avant petrol engines (2019-2024)

The revised Audi A4 B9 Avant TFSI family received 12-volt mild hybrid technology (MHEV) throughout. The entry-level engine was now the 35 TFSI with 110 kW (150 PS), followed by the 40 TFSI with 140 kW (190 PS) and the 45 TFSI with 180 kW (245 PS). All engines used the further developed EA888 generation with improved efficiency and reduced oil consumption. The 35 TFSI proved to be particularly mature and trouble-free, while the 45 TFSI still occasionally showed increased oil consumption despite improvements. The S4 Avant with 3.0 TFSI V6 and 260 kW (354 hp) was a new addition, which offered virtually turbocharged power delivery thanks to the electric power compressor (EPC), but was technically very complex.

Audi A4 B9 Avant diesel engines (2019-2024)

The Audi A4 B9 Avant TDI engines also received mild hybrid support and new designations: The 35 TDI with 120 kW (163 PS), 40 TDI with 150 kW (204 PS) and the top-of-the-range 45 TDI engine with 170 kW (231 PS). All variants of the 2.0 TDI used the revised EA288 generation with improved exhaust gas aftertreatment and AdBlue injection. The 40 TDI became the absolute favorite for frequent drivers, as it offered a high level of everyday practicality with standard fuel consumption of just 4.1-4.6 liters per 100 km. Problems mainly occurred on short journeys, where the particulate filter could not be sufficiently cleared.

Audi A4 B9 Avant plug-in hybrid (2019-2024)

For the first time, Audi also offered the A4 Avant as a plug-in hybrid (50 TFSI e) with a system output of 220 kW (299 PS). This combined a 2.0 TFSI with an electric motor and offered an electric range of up to 67 km. The Audi A4 B9 Avant PHEV proved to be technically mature, but had limitations in terms of trunk space due to the battery and was more maintenance-intensive than the conventional drives.

Audi A4 B9 Avant engines (2024-today)

The current generation of the Audi A4 B9 Avant consistently focuses on electrification and represents the final evolutionary stage of combustion engines at Audi. All petrol engines are now equipped with 48-volt mild hybrid technology, while the plug-in hybrids offer an electric range of over 80 kilometers. As this generation has only been available since 2024, long-term experience is not yet available, but the first test reports show a significant improvement in efficiency and running smoothness. The top-of-the-range engine is the revised 40 TDI with 48-volt mild hybrid, which achieves a standard consumption of just 3.9 liters thanks to optimized combustion and electric assistance. The new 48-volt technology promises an engine service life of over 400,000 kilometers thanks to the more powerful electric support.

Audi A4 B9 Avant mild hybrid petrol engine (2024-today)

The Audi A4 B9 Avant engine range is now based exclusively on mild-hybrid engines with a 48-volt electrical system. The 35 TFSI MHEV delivers 110 kW (150 PS), the 40 TFSI MHEV 140 kW (190 PS) and the new 45 TFSI MHEV 195 kW (265 PS). All Audi A4 B9 Avant engines have a belt starter-alternator and can drive purely electrically for up to 12 seconds. The 40 TFSI MHEV is considered to be particularly successful and is developing into the best petrol engine of this generation - it offers spontaneous throttle response thanks to the electric assistance and has so far been free of series production problems.

Audi A4 B9 Avant diesel engines (2024-today)

The Audi A4 B9 Avant TDI family has been reduced to two engines: The 40 TDI MHEV with 150 kW (204 hp) and the new 45 TDI MHEV with 170 kW (231 hp). Both use the latest EA288 generation with optimized combustion and 48-volt mild hybrid support. The 40 TDI MHEV continues the tradition of reliable Audi A4 B9 Avant diesels and achieves record fuel consumption of just 3.9 liters per 100 km in the standard cycle thanks to electric assistance.

Audi A4 B9 Avant plug-in hybrid (2024-today)

The revised 50 TFSI e quattro now offers a system output of 220 kW (299 PS) and an electric range of up to 82 km. The larger battery and optimized energy management make this Audi A4 B9 Avant PHEV a real alternative for commuters, but the restriction on trunk space remains.

Conclusion: The best Audi A4 B9 Avant engines of all generations

The development of the Audi A4 B9 Avant engines shows a continuous improvement in terms of reliability and efficiency. While the first generation was already very mature, the mild hybrid systems of the later generations brought further significant progress. The TDI engines have remained the most reliable choice across all generations, while the TFSI petrol engines have become significantly more attractive thanks to electrification.

• Best Audi A4 B9 Avant gasoline engine:

The 40 TFSI MHEV (190 hp, Generation III) combines proven EA888 technology with modern 48-volt mild hybrid support, offering the optimum balance between performance, efficiency and reliability.

• Best Audi A4 B9 Avant diesel engine:

The 40 TDI MHEV (204 hp, Generation III) with its record fuel consumption of 3.9 liters and proven EA288 reliability represents the pinnacle of diesel development.

• Best Audi A4 B9 Avant hybrid engine:

The 50 TFSI e (299 hp, Generation III) with 82 km electric range offers the best combination of performance and zero local emissions for commuters and corporate customers.

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