2020-2024 Audi A4 (B9 8W facelift ) 40 TFSI (204 Hp) Mild Hybrid S tronic

The Audi A4 40 TFSI Mild Hybrid S tronic, produced from July 2020 through 2024, represents a significant iteration of the B9 (8W) generation A4, following the 2019 facelift. Positioned as a mid-range offering within the A4 lineup, this variant aimed to balance performance, fuel efficiency, and technology, appealing to a broad spectrum of buyers in the premium compact executive car segment. It served as a key model in Audi’s strategy to incorporate mild hybrid technology across its range, enhancing fuel economy and reducing emissions while maintaining a familiar driving experience. The 40 TFSI designation, according to Audi’s naming convention, doesn’t directly correlate to engine displacement but rather indicates a relative performance level within the A4 family.

Technical Specifications

INTRODUCTION

The Audi A4 40 TFSI Mild Hybrid S tronic, launched in 2020 as part of the B9 facelift, represents a key step in Audi’s electrification strategy. Built on the Volkswagen Group’s MLB Evo platform (specifically the A4/A5 variant), this model aimed to deliver a refined driving experience with improved fuel efficiency. The “40 TFSI” designation signifies a power output level, and this variant occupied a central position in the A4 range, slotting between the entry-level 35 TFSI and the more potent 45 TFSI models. It was primarily marketed towards buyers seeking a balance of performance, comfort, and technology in a premium compact sedan.

Powertrain & Engine Architecture

At the heart of the A4 40 TFSI lies the DMSA engine, a 2.0-liter turbocharged inline-four cylinder gasoline engine. This engine utilizes direct fuel injection and an integrated exhaust manifold for improved thermal management and responsiveness. The engine produces 204 horsepower at 4475-6000 rpm and 320 Nm (236 lb-ft) of torque between 1450-4475 rpm. The “Mild Hybrid” component consists of a 12V belt alternator-starter (BAS) system. This system allows for extended start-stop functionality, regenerative braking to recoup energy during deceleration, and a slight power assist during acceleration. The engine is longitudinally mounted, driving the front wheels. The S tronic 7-speed dual-clutch transmission provides quick and smooth gear changes. This transmission is known for its efficiency and responsiveness, contributing to the car’s overall performance and fuel economy. Gear ratios are optimized for both acceleration and highway cruising.

Driving Characteristics

The A4 40 TFSI S tronic delivers a composed and refined driving experience. While not as overtly sporty as the higher-output 45 TFSI, it provides ample power for everyday driving and confident overtaking. The S tronic transmission contributes to brisk acceleration, with a 0-60 mph time of around 6.7 seconds. The mild hybrid system is largely imperceptible to the driver, working seamlessly in the background to improve efficiency. Compared to the manual transmission versions of the same engine, the S tronic offers quicker shifts and a more relaxed driving experience, particularly in urban traffic. The front-wheel-drive configuration provides good traction in most conditions, although it may exhibit some torque steer under hard acceleration.

Equipment & Trim Levels

The A4 40 TFSI typically came standard with a generous array of features, including Audi’s Virtual Cockpit digital instrument cluster, a 10.1-inch touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, three-zone automatic climate control, and a suite of driver-assistance systems such as lane departure warning and forward collision warning. Interior upholstery was typically cloth or leatherette, with optional leather upgrades available. Trim levels varied by market, but generally included options for enhanced interior lighting, premium sound systems, and larger alloy wheels. Optional extras included a sunroof, navigation system, and adaptive cruise control.

Chassis & Braking

The A4 40 TFSI utilizes a sophisticated suspension setup, featuring independent multi-link suspension at both the front and rear axles. This provides a comfortable ride quality while maintaining good handling characteristics. The steering is precise and well-weighted, offering a good balance of feedback and assistance. Braking duties are handled by ventilated discs at the front and solid discs at the rear. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard features, ensuring safe and controlled braking performance. The suspension tuning is generally geared towards comfort, but optional sport suspension packages were available for a firmer ride and more dynamic handling.

Market Reception & Comparison

The A4 40 TFSI Mild Hybrid S tronic was generally well-received by automotive critics. It was praised for its refined driving experience, fuel efficiency, and comfortable interior. Compared to the 35 TFSI, the 40 TFSI offered a noticeable performance upgrade, while remaining more affordable than the 45 TFSI. Fuel economy figures were competitive within the segment, with the mild hybrid system contributing to lower emissions and improved MPG. Reliability reports have been generally positive, with the 2.0 TFSI engine proving to be a durable and dependable unit. However, some owners have reported minor issues with the infotainment system and the BAS system.

Legacy

The Audi A4 40 TFSI Mild Hybrid S tronic represents an important step in Audi’s transition towards electrification. The integration of mild hybrid technology demonstrated Audi’s commitment to reducing emissions and improving fuel efficiency. In the used car market, these models are generally sought after for their balance of performance, comfort, and technology. The 2.0 TFSI engine is known for its reliability, and the S tronic transmission is generally well-regarded. However, as with any used vehicle, potential buyers should carefully inspect the car’s maintenance history and consider a pre-purchase inspection by a qualified mechanic.