Audi A4/A5 Coolant Reservoir / Tank / Bottle 8W0121405K

OEM Part #: 8W0-121-405-K (8W0121405K)

This page covers one exact OEM part number. Every unit we stocked has sold.

This used OEM Audi coolant reservoir, tank, or bottle carries part number 8W0121405K. It's a genuine plastic expansion tank that holds and degasses the engine coolant, allowing the cooling system to maintain proper pressure and temperature. A cracked or leaking reservoir will cause visible coolant loss and potential overheating. It was removed from a compatible 2.0L turbocharged four-cylinder engine application, including EA888 variants.

Specifications

Specifications for Coolant Reservoir / Tank / Bottle 8W0121405K
Fits Vehicle ModelA4, A5
Fits Vehicle MakeAudi
OEM Part No8W0-121-405-K (8W0121405K)
CategoryRadiator / Coolant

Compatible Vehicles

Fits 36 vehicle configurations across 1 make, 2017-2025.

Check your specific vehicle before ordering. This list shows year, make, and model. Some years have multiple trims or engines that use different parts, and individual listings may have additional fitment notes (e.g. “with sunroof only”). Review the full variant list below, or message us with your VIN and we’ll confirm the match.

Audi

  • A4 2017-2024 · 12 variants
  • A5 2017-2025 · 24 variants
View all 36 vehicle configurations
Full vehicle fitment list for Coolant Reservoir / Tank / Bottle 8W0121405K
Year Make Model Trim Engine Note
2017 Audi A4 Sedan 2.0L l4 Turbo
2017 Audi A4 Quattro Sedan 2.0L l4 Turbo
2017 Audi A5 Quattro Convertible 2.0L l4 Turbo
2017 Audi A5 Quattro Coupe 2.0L l4 Turbo
2018 Audi A4 Sedan 2.0L l4 Turbo
2018 Audi A4 Quattro Sedan 2.0L l4 Turbo
2018 Audi A5 Quattro Convertible 2.0L l4 Turbo
2018 Audi A5 Quattro Coupe 2.0L l4 Turbo
2018 Audi A5 Hatchback 2.0L l4 Turbo
2019 Audi A4 Sedan 2.0L l4 Turbo
2019 Audi A4 Quattro Sedan 2.0L l4 Turbo
2019 Audi A5 Quattro Convertible 2.0L l4 Turbo
2019 Audi A5 Quattro Coupe 2.0L l4 Turbo
2019 Audi A5 Hatchback 2.0L l4 Turbo
2020 Audi A4 Sedan 2.0L l4 Turbo
2020 Audi A4 Quattro Sedan 2.0L l4 Turbo
2020 Audi A5 Quattro Convertible 2.0L l4 Turbo
2020 Audi A5 Quattro Coupe 2.0L l4 Turbo
2020 Audi A5 Hatchback 2.0L l4 Turbo
2021 Audi A4 Quattro Sedan 2.0L l4 Turbo
2021 Audi A5 Quattro Convertible 2.0L l4 Turbo
2021 Audi A5 Quattro Coupe 2.0L l4 Turbo
2021 Audi A5 Hatchback 2.0L l4 Turbo
2022 Audi A4 Quattro Sedan 2.0L l4 Turbo
2022 Audi A5 Quattro Convertible 2.0L l4 Turbo
2022 Audi A5 Quattro Coupe 2.0L l4 Turbo
2022 Audi A5 Hatchback 2.0L l4 Turbo
2023 Audi A4 Quattro Sedan 2.0L l4 Turbo
2023 Audi A5 Quattro Convertible 2.0L l4 Turbo
2023 Audi A5 Quattro Coupe 2.0L l4 Turbo
2023 Audi A5 Hatchback 2.0L l4 Turbo
2024 Audi A4 Quattro Sedan 2.0L l4 Turbo
2024 Audi A5 Quattro Convertible 2.0L l4 Turbo
2024 Audi A5 Quattro Coupe 2.0L l4 Turbo
2024 Audi A5 Hatchback 2.0L l4 Turbo
2025 Audi A5 Hatchback 2.0L l4 Turbo

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