Original Fuel Tank Heat Shield / Thermal Insulation – 4K0201781A

Original factory fuel tank heat shield and thermal protection (fuel tank lower heat shield / exhaust system heat shield – Wärmeschutzblech Kraftstoffbehälter / Hitzeschild Tank), designed for Audi A7 Sportback, S7 and RS7 (4K / 4K8 generation), as well as Audi A6 C8 (type 4K2 / 4K5 / 4KA) produced from 2018 to 2026, including versions with 3.0 V6 TFSI (55 TFSI / 340 hp) petrol engines, 2.0 TFSI (40/45 TFSI), S7 and RS7 variants, and TDI diesel units with Mild Hybrid (MHEV 48V) systems and quattro drive, based on the modular MLBevo longitudinal platform.

Original VAG thermal protection and chassis component. Made from multi-layer, profiled, press-formed aluminum sheet with a bubble/diamond structure (for stiffening and dispersing heat waves), characterized by negligible weight and high resistance to temperatures exceeding 600°C. Mounted underneath the vehicle between the plastic fuel tank wall and the exhaust pipes and resonators. It is responsible for directly shielding the plastic tank from heat radiation from the exhaust, preventing excessive fuel heating, increased vapor pressure in the chamber (EVAP system), and protecting the tank from the risk of thermal deformation.

Technical specifications:

• Catalog part number (OE): 4K0201781A / 4K0 201 781 A (and related revisions from the 4K0201781, 4K0201781B, 4K0201781C series)

• System / Category: Fuel system, exhaust, and chassis thermal protection / Fuel tank heat shields, heat screens, thermal insulation (Fuel Tank Heat Shield / Wärmeschutzblech Kraftstofftank)

• Function: Shielding and protecting the plastic tank from high temperatures from the exhaust system

• Construction: Formed multi-layer aluminum plate with heat-dispersing embossings and integrated points for elastic washers

• Material: Specialty aluminum alloy with high thermal reflectivity

• Mounting location: Vehicle chassis – center-rear area (in the space between the tank and the exhaust pipe line)

• Dedicated model: Audi A7 Sportback / S7 / RS7 (type 4K8) and Audi A6 / Avant / Allroad (type 4K - C8)

• Engine compatibility: 3.0 V6 TFSI (55 TFSI), 2.0 TFSI, 4.0 V8 (RS7) petrol engines, TDI units, and versions with 63L and 73L tanks (PR-0M4 / PR-0M5)

• Steering side: Left (LHD) and Right (RHD) – universal component

• Condition: Original part, used (100% functional – in undamaged condition, factory geometry without dents or bends, mounting holes intact, not bent or torn, no material fatigue cracks)

• Manufacturer: Audi AG / VAG (Original OEM)

Main application:

• Audi:

  • A7 Sportback (type 4K8) – model years from 2018 to 2026 (all engine versions with single or dual exhaust systems)

  • S7 Sportback (type 4K8) – model years from 2019 to 2026

  • RS7 Sportback (type 4K8) – model years from 2019 to 2026

  • A6 / A6 Avant / Allroad (type 4K2 / 4K5 / 4KA - C8) – model years from 2018 to 2026

  • S6 / RS6 Avant (type 4K - C8) – model years from 2019 to 2026

Fitment guarantee and VIN verification

Each heat shield undergoes a detailed inspection of the flanges around the mounting holes for oxidation, as well as a geometry check on a chassis template before preparation for shipping.

Fitment / installation tip: The initial designation 4K0 (fuel system group 201 / 781) with index A defines the heat shield profile precisely matched to the curvature of the MLBevo platform fuel tanks. The most common damage to aluminum shields is galvanic corrosion and the tearing of mounting holes by steel spring clips (so-called clamping plates/washers) due to vibrations and road salt. A loose shield drops onto the hot exhaust pipes, causing loud metallic rattling during acceleration or at idle, and in extreme cases, exposes the tank to heat. The offered shield has factory-rigid, unworn mounting points. Before installation, it is recommended to use new N90796502 elastic washers. Before purchase, we recommend comparing the OE designation or verifying it using the vehicle's VIN.