Exhaust Catalyst / Catalytic Reactor – 4K0254250N / 8W0131703AA

Original factory exhaust catalyst (main catalytic reactor of the exhaust system), designed for Audi A7 Sportback (4K / 4K8 generation) and Audi A6 (C8 / 4K generation) cars with 3.0 TFSI V6 (55 TFSI) engines.

Exhaust system component with an original factory insert. Guarantees proper exhaust flow, optimal engine performance, no engine control unit/lambda sensor errors (no Check Engine light), and full compliance with emission standards.

Technical specifications:

• OE part number: 4K0254250N / 4K0 254 250 N

• Can / casting numbers: 8W0131703AA / 8W0 131 703 AA

• Engine: 3.0 TFSI V6 (55 TFSI designation, including DLZA codes and related ones)

• Installation side: Exhaust system – front / after the turbocharger

• Steering side: Left (LHD – European version)

• Condition: Original used part (100% functional, ceramic insert intact, not burnt out, not crumbled, lambda sensor threads intact, flanges straight)

• Manufacturer: Audi / VAG (Original OEM)

Main applications:

• Audi:

  • A7 Sportback (4K8) – model years 2018 to 2024 (3.0 TFSI / 55 TFSI engines)

  • A6 Saloon / Avant / Allroad (C8 / 4K) – model years 2018 to 2024 (3.0 TFSI / 55 TFSI engines)

  • Q8 (4MN) / Q7 (4MB Lift) – selected versions with the 3.0 TFSI V6 engine

Fitment guarantee and VIN verification

Each catalyst undergoes a thorough endoscopic/visual core inspection for flow, mesh cleanliness, and absence of mechanical damage to the housing.

Fitment tip: In 3.0 TFSI V6 engines on the MLBevo platform, exhaust components may vary depending on the model year, emission standards (versions with or without a GPF/OPF filter), and the intended market (USA / Europe). Before purchase, we recommend comparing the markings on the old catalyst or verifying fitment using the vehicle's VIN.