The Audi A4 (B6), produced between 2002 and 2005, represented a significant evolution for Audi’s popular compact executive car. The 1.8T Multitronic variant, specifically those manufactured between 2002 and 2004, occupied a key position in the A4 lineup, offering a blend of performance and efficiency aimed at buyers seeking a more refined driving experience than the base models, but without the higher price tag of the more powerful options like the 3.0 V6. This model utilized Audi’s continuously variable transmission (CVT), marketed as Multitronic, paired with the turbocharged 1.8-liter four-cylinder engine. It was primarily sold in European and North American markets, appealing to customers who valued fuel economy and smooth acceleration in a premium package.
Technical Specifications
| Brand | Audi |
| Model | A4 |
| Generation | A4 (B6 8E) |
| Type (Engine) | 1.8 T (163 Hp) Multitronic |
| Start of production | 2002 |
| End of production | 2004 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 11.3 l/100 km (20.8 US mpg) |
| Fuel consumption (extra urban) | 6.4 l/100 km (36.8 US mpg) |
| Fuel consumption (combined) | 8.2 l/100 km (28.7 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.6 sec |
| Acceleration 0 – 62 mph | 8.6 sec |
| Acceleration 0 – 60 mph | 8.2 sec |
| Maximum speed | 223 km/h (138.57 mph) |
| Weight-to-power ratio | 8.7 kg/Hp |
| Weight-to-torque ratio | 6.3 kg/Nm |
| Power | 163 Hp @ 5700 rpm |
| Torque | 225 Nm @ 1950-4700 rpm (165.95 lb.-ft. @ 1950-4700 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | BFB |
| Engine displacement | 1781 cm3 (108.68 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 81 mm (3.19 in.) |
| Piston Stroke | 86.4 mm (3.4 in.) |
| Compression ratio | 9.3:1 |
| Number of valves per cylinder | 5 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 4.1 l (4.33 US qt | 3.61 UK qt) |
| Coolant capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Kerb Weight | 1420 kg (3130.56 lbs.) |
| Max. weight | 1970 kg (4343.11 lbs.) |
| Max load | 550 kg (1212.54 lbs.) |
| Trunk (boot) space – minimum | 445 l (15.72 cu. ft.) |
| Trunk (boot) space – maximum | 720 l (25.43 cu. ft.) |
| Fuel tank capacity | 70 l (18.49 US gal | 15.4 UK gal) |
| Length | 4548 mm (179.06 in.) |
| Width | 1772 mm (69.76 in.) |
| Height | 1428 mm (56.22 in.) |
| Wheelbase | 2650 mm (104.33 in.) |
| Front track | 1528 mm (60.16 in.) |
| Rear track | 1526 mm (60.08 in.) |
| Drag coefficient (Cd) | 0.30 |
| Minimum turning circle | 11.1 m (36.42 ft.) |
| Drivetrain | Front wheel drive |
| Number of gears | Continuously Variable (Multitronic) |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 205/55 R16 |
| Wheel rims size | 7J x 16 |
Powertrain & Engine Architecture
The heart of the A4 1.8T Multitronic is the BFB engine code, a 1.8-liter inline-four cylinder gasoline engine. This engine features a single turbocharger with an intercooler, boosting power output to 163 horsepower and 166 lb-ft of torque. Fuel delivery is managed by a multi-port fuel injection system. The engine utilizes a double overhead camshaft (DOHC) valvetrain with five valves per cylinder (three intake, two exhaust), contributing to its relatively high specific output. The Multitronic transmission is a continuously variable transmission (CVT) that uses a chain drive instead of a traditional belt, improving durability. It offers seamless gear changes and allows the engine to operate in its most efficient range, enhancing fuel economy. The Multitronic transmission featured a “sport” mode which altered shift points for more aggressive acceleration.
Driving Characteristics
The 1.8T Multitronic offered a distinctly different driving experience compared to the A4 models equipped with manual transmissions or the more powerful 3.0 V6. While not as overtly sporty as the manual versions, the Multitronic provided smooth, effortless acceleration. The CVT eliminated traditional gear shifts, resulting in a linear power delivery. The transmission’s programming prioritized fuel efficiency, making it well-suited for daily commuting. However, some drivers found the engine could feel somewhat strained under hard acceleration, lacking the immediate response of a traditional gearbox. The Multitronic’s ratios were geared towards comfortable cruising, and while capable, it wasn’t designed for aggressive driving.
Equipment & Trim Levels
The 1.8T Multitronic typically came standard with features such as automatic climate control, power windows and locks, a premium audio system, and alloy wheels. Interior upholstery was generally cloth, with leather options available as an upgrade. Common optional extras included a sunroof, heated front seats, and a navigation system. The trim level often fell in the mid-range of the A4 lineup, offering a good balance of features and price. It was positioned above the base 1.8T models with manual transmissions but below the higher-performance 3.0 V6 variants.
Chassis & Braking
The A4 B6 chassis featured an independent multi-link suspension at both the front and rear, providing a comfortable ride and good handling characteristics. The 1.8T Multitronic models typically used ventilated disc brakes at the front and solid disc brakes at the rear. Anti-lock braking system (ABS) was standard. Stabilizer bars were fitted front and rear to reduce body roll during cornering. The suspension tuning was geared towards comfort, but the A4 still offered a reasonably engaging driving experience.
Market Reception & Comparison
The A4 1.8T Multitronic was generally well-received by automotive critics. It was praised for its smooth ride, refined interior, and fuel efficiency. However, some reviewers noted the CVT’s lack of engagement compared to a traditional manual transmission. Compared to the 1.8T manual, the Multitronic offered improved fuel economy and ease of use, but at the expense of some driver involvement. The 3.0 V6 offered significantly more power but came with a higher price tag and lower fuel economy. Reliability was generally good, although the Multitronic transmission required regular fluid changes to prevent premature wear.
Legacy
The Audi A4 B6 1.8T Multitronic remains a popular choice in the used car market. The BFB engine is known for its reliability when properly maintained. However, the Multitronic transmission is a potential weak point, and prospective buyers should ensure it has been serviced regularly. Parts availability is generally good, and the A4 B6 is relatively easy to maintain. The combination of a turbocharged engine, comfortable ride, and premium features has ensured its continued appeal to buyers seeking a well-rounded and affordable luxury sedan.
