The 06K 121 143 is an OE-spec coolant hose adapter for select Volkswagen and Audi EA888 1.8T and 2.0T applications. Precision-molded to factory specifications, this direct-fit replacement restores a factory-tight seal at critical coolant junctions — no modifications required. Includes O-ring.
$5.25
The 06K 121 143 Coolant Hose Adapter is a genuine-spec replacement fitting used on select Volkswagen and Audi EA888 1.8T and 2.0T applications. Mounted in the cylinder head, this adapter serves as a critical junction point in the cooling system, providing a secure and sealed connection between coolant hoses and engine components such as the cylinder head and water pump housing. It ensures coolant is routed correctly and maintained under pressure without leaks.
Over time, the original plastic or composite adapter is subjected to extreme heat cycles and vibration, causing the material to become brittle, warp, or develop hairline cracks. This leads to persistent coolant seepage, low-coolant warnings, and potential engine overheating if left unaddressed. Replacing the failing unit with this direct-fit 06K 121 143 restores a factory-tight seal and maintains the integrity of the cooling system.
Identifying failure early prevents serious thermal engine damage. Look for the following symptoms:
Visible coolant residue or active dripping near the cylinder head or water pump housing
Persistent low-coolant warnings despite regular top-offs
Physical cracking, warping, or brittleness of the adapter body
Dried white or pink crusty deposits (coolant crystallization) at hose connection points
If any of these indicators are present, the adapter should be replaced immediately.
OEM Reference: 06K 121 143
OE-quality construction for precise fitment and reliable sealing
Engineered to withstand high engine temperatures and cooling system pressure
Precision-molded connection points for a secure, leak-free hose interface
Includes new O-ring for a complete installation
Direct-fit replacement — no modifications required
Replace all associated O-rings and hose clamps during installation to ensure a long-lasting, leak-free seal
Refill with VW/Audi-approved G12++ or G13 coolant only — do not mix coolant types
Perform a complete system bleed after filling to remove trapped air
Inspect nearby plastic coolant flanges and aging hoses — replacing simultaneously prevents repeat service visits
Always verify fitment by VIN before ordering. Multiple variants and engine codes may exist within the same model year.
06K 121 143
06K 121 143A
06K 121 143B
06K 121 143C
| Weight | 0.80 lbs |
|---|---|
| Dimensions | 6.0 × 4.0 × 3.0 in |
| Year | Make | Model | Engine | Notes |
|---|---|---|---|---|
| 2015-2019, 2022-2024 | Audi | A3 | ||
| 2017-2020 | Audi | A4 | ||
| 2012-2022 | Audi | A5 | ||
| 2016-2018 | Audi | A6 | ||
| 2019-2026 | Audi | Q3 | ||
| 2018-2022 | Audi | Q5 | ||
| 2020-2022 | Audi | Q5 PHEV | ||
| 2015-2020 | Audi | S3 | ||
| 2016-2022 | Audi | TT | ||
| 2016-2022 | Audi | TTS | ||
| 2018-2023 | Volkswagen | Atlas | ||
| 2013-2019 | Volkswagen | Beetle | ||
| 2015-2024 | Volkswagen | GTI | ||
| 2015-2019 | Volkswagen | Golf R | ||
| 2015-2019 | Volkswagen | Golf SportWagen | ||
| 2013-2021 | Volkswagen | Jetta | ||
| 2014-2021 | Volkswagen | Passat | ||
| 2018-2022 | Volkswagen | Tiguan |
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