Original Front Subframe / Power Steering Rack / Front Suspension Crossmember – Audi A7 Sportback 3.0 TFSI (type 4K8) – 4K1399347C

Original factory front suspension and powertrain support frame – power steering rack / front subframe (front axle auxiliary frame – Aggregateträger Vorne / Vorderachsträger / Front Subframe Crossmember), designed for Audi A7 Sportback 55 TFSI and S7 (4K8 / C8 generation) manufactured from model year 2018 to 2026+, with particular regard to versions with the turbocharged petrol engine 3.0 TFSI V6 (EA839 / DLZA engine with 340 hp), mild hybrid system (MHEV 48V) and four-wheel drive quattro, based on the modular floor plate MLB Evo.

Original Audi OE structural component. Made from high-strength pressure-die-cast and profiled aluminum alloy with optimized torsional rigidity and reduced weight. The subframe is a key structural element of the vehicle's front axle – it serves as the mounting base for the lower and upper control arms of the multi-link suspension, electric power steering rack, engine mounts and the V6 powertrain assembly, and the front stabilizer bar. The frame design guarantees the absolute preservation of the factory 3D geometry base points and precise damping of vibrations generated by the powertrain and the road surface.

Technical specifications:

• Catalog part number (OE):4K1399347C / 4K1 399 347 C (and related engineering revisions from the 4K1399347,4K1399347A,4K1399347B,4K1399347D)

• System / Category: Suspension and powertrain system / Auxiliary frames, front suspension subframes, front subframes (Front Axle Subframe / Aggregateträger)

• Mounting location: Vehicle front axle – longitudinal members and underside of the engine compartment (main support frame for the powertrain and suspension)

• Material: High fatigue strength and corrosion-resistant aluminum alloy casting

• Dedicated engine:3.0 TFSI V6 (55 TFSI / 340 hp) and related V6 petrol variants 2.9 / 3.0 TFSI

• Dedicated model:Audi A7 Sportback (type 4K8) and related MLB Evo platform models (Audi A6 C8 type 4K)

• Production years: from 2018 to 2026+

• Steering side: Left (LHD)

• Condition: Original part, used (very good condition – structure 100% straight and undamaged, no casting cracks, no post-collision bends, all mounting threads for engine mounts, steering rack and control arms undamaged, all metal-rubber bushing housings intact)

• Manufacturer: Audi AG (Original OEM)

Main application:

• Audi:

  • A7 Sportback 55 TFSI quattro (type 4K8) – model years 2018 to 2026+ (3.0 TFSI V6 engine)

  • S7 Sportback TFSI (type 4K8 – US/non-European market versions) – model years 2019 to 2026+ (2.9 TFSI V6 engine)

  • A6 Saloon / Avant 55 TFSI quattro (type 4K2 / 4K5 / C8) – model years 2018 to 2026+ (3.0 TFSI V6 engine)

(Note: Engine mount bolt pattern and frame geometry configured specifically for the V6 powertrain on the MLB Evo platform. Does not fit older A7 4G8 and A6 C7 models).

Installation and operating instructions

Before storage, each subframe undergoes verification on a measuring plate for base point alignment and inspection of the threads in the structural screw housings.

Fitment / installation note: Catalog designation 4K1399347C specifies the front aluminum auxiliary frame for models with the 3.0 TFSI engine and left-hand drive. In front-end collision repairs, replacing the subframe with an original, non-stretched OEM component is the only way to correctly set the suspension geometry angles (camber, caster, and toe) and eliminate vehicle pulling or uneven tire wear. Mounting to the body longitudinal members requires the use of new factory stretch bolts and tightening them to the manufacturer's recommended torque. Before purchase, we recommend verification using the vehicle's VIN.