2017-2018 Audi Q7 Coolant Reservoir / Tank / Bottle 4M0121405K
OEM Part #: 4M0-121-405-K (4M0121405K)
Actual photo
The exact part you’ll receive — not a stock photo.
$33.99
Used
Donor2018 Audi Q7 · 3.0L
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Genuine OEM Used
SKU: 615944
Donor Vehicle: 2018 Audi Q7 · 3.0L
3 photos
$33.99
30-Day Returns
Genuine OEM Used
SKU: 692863
Donor Vehicle: 2017 Audi Q7 · 2.0L
3 photos
$33.99
30-Day Returns
- Genuine OEM — real photos
- 30-day returns on eligible parts
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A used genuine OEM Audi Coolant Reservoir (tank/bottle), part number 4M0121405K. This reservoir also replaces 4M0121403D. It holds engine coolant and is prone to cracking at the seams or hose barbs over time, leading to low-coolant warnings or overheating. Fits Audi Q7 models with the 2.0L turbo, 3.0L diesel turbo, or 3.0L supercharged engines.
Specifications
| Fits Vehicle Model | Q7 |
| Fits Vehicle Make | Audi |
| OEM Part No | 4M0-121-405-K (4M0121405K) |
| Compatible OEM Part No | 4M0-121-403-D |
| Category | Radiator / Coolant |
Compatible Vehicles
Fits 4 vehicle configurations across 1 make, 2017-2018.
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.
View all 4 vehicle configurations — 4 with fitment notes
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2017 | Audi | Q7 | SUV | 3.0L V6 Supercharged | For Vehicles With Production date Up To 11/27/17 |
| 2018 | Audi | Q7 | SUV | 3.0L V6 Supercharged | For Vehicles With Production date Up To 11/27/17 |
| 2017 | Audi | Q7 | SUV | 2.0L l4 Turbo | For Vehicles With Production date Up To 11/27/17 |
| 2018 | Audi | Q7 | SUV | 2.0L l4 Turbo | For Vehicles With Production date Up To 11/27/17 |