2019-2024 Audi / Porsche AC Expansion Valve 4M0816805B
OEM Part #: 4M0-816-805-B (4M0816805B)
Porsche Part #: PAB816805
Actual photo
The exact part you’ll receive — not a stock photo.
$27.99
Used
Donor2022 Porsche TAYCAN · ELECTRIC
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Only 2 in stock — no guaranteed restock
Genuine OEM Used
SKU: 513527
Donor Vehicle: 2022 Porsche TAYCAN · ELECTRIC
2 photos
$27.99
30-Day Returns
Genuine OEM Used
SKU: 573523
Donor Vehicle: 2023 Porsche TAYCAN · ELECTRIC · 7k miles
2 photos
$27.99
30-Day Returns
- Genuine OEM — real photos
- 30-day returns on eligible parts
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This used OEM AC expansion valve, part number 4M0816805B (also listed as PAB816805), meters refrigerant flow into the evaporator. When it fails, common symptoms include weak or intermittent cabin cooling, frost on lines, or a hissing sound from the dash. It's a direct-fit replacement for Audi and Porsche models equipped with hybrid, plug-in hybrid, or battery-electric powertrains. Expect restored AC performance if your original valve is stuck or leaking.
Specifications
| Fits Vehicle Model | A6, A8, e-tron, e-tron GT, e-tron S, Q5, Q5 PHEV, Q7, S8, Taycan |
| Fits Vehicle Make | Audi, Porsche |
| OEM Part No | 4M0-816-805-B (4M0816805B) |
| Porsche Part No | PAB816805 |
| Category | Air Conditioning |
Compatible Vehicles
Fits 84 vehicle configurations across 2 makes, 2019-2024.
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 84 vehicle configurations — 12 with fitment notes
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2020 | Audi | Q5 PHEV | SUV | 2.0L l4 Turbo | |
| 2024 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2024 | Audi | Q5 | SUV | 2.0L l4 Turbo | |
| 2021 | Audi | Q5 PHEV | SUV | 2.0L l4 Turbo | |
| 2024 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo | |
| 2024 | Audi | Q7 | SUV | 2.0L l4 Turbo | |
| 2024 | Audi | Q5 PHEV | SUV | 2.0L l4 Turbo | |
| 2022 | Audi | Q5 PHEV | SUV | 2.0L l4 Turbo | |
| 2021 | Audi | Q5 | SUV | 2.0L l4 Turbo | |
| 2022 | Audi | Q5 | SUV | 2.0L l4 Turbo | |
| 2024 | Audi | Q7 | SUV | 3.0L V6 Turbo | For Vehicles with Production Date After 11/24/19 |
| 2023 | Audi | Q5 | SUV | 2.0L l4 Turbo | |
| 2024 | Audi | A6 | Quattro Sedan | 2.0L l4 Turbo | For Vehicles with Production Date After 02/22/21 |
| 2023 | Audi | Q5 PHEV | SUV | 2.0L l4 Turbo | |
| 2024 | Porsche | Taycan | Turbo S Turismo Wagon | Electric Vehicle | |
| 2024 | Porsche | Taycan | GTS Turismo Wagon | Electric Vehicle | |
| 2024 | Porsche | Taycan | Sedan | Electric Vehicle | |
| 2024 | Porsche | Taycan | 4S Sedan | Electric Vehicle | |
| 2024 | Porsche | Taycan | GTS Sedan | Electric Vehicle | |
| 2024 | Porsche | Taycan | Turbo S Sedan | Electric Vehicle | |
| 2024 | Porsche | Taycan | Turbo Turismo Wagon | Electric Vehicle | |
| 2024 | Porsche | Taycan | Turbo Sedan | Electric Vehicle | |
| 2024 | Porsche | Taycan | 4S Turismo Wagon | Electric Vehicle | |
| 2024 | Porsche | Taycan | 4 Turismo Wagon | Electric Vehicle | |
| 2022 | Porsche | Taycan | GTS Turismo Wagon | Electric Vehicle | |
| 2022 | Porsche | Taycan | 4S Turismo Wagon | Electric Vehicle | |
| 2022 | Porsche | Taycan | GTS Wagon | Electric Vehicle | |
| 2023 | Porsche | Taycan | Turbo Turismo Wagon | Electric Vehicle | |
| 2023 | Porsche | Taycan | Turbo Sedan | Electric Vehicle | |
| 2022 | Porsche | Taycan | 4S Sedan | Electric Vehicle | |
| 2020 | Porsche | Taycan | 4S Sedan | Electric Vehicle | |
| 2021 | Porsche | Taycan | Turbo S Turismo Wagon | Electric Vehicle | |
| 2023 | Porsche | Taycan | GTS Sedan | Electric Vehicle | |
| 2023 | Porsche | Taycan | Turbo S Sedan | Electric Vehicle | |
| 2021 | Porsche | Taycan | Turbo Sedan | Electric Vehicle | |
| 2023 | Porsche | Taycan | 4 Turismo Wagon | Electric Vehicle | |
| 2022 | Porsche | Taycan | Turbo S Sedan | Electric Vehicle | |
| 2023 | Porsche | Taycan | Sedan | Electric Vehicle | |
| 2020 | Porsche | Taycan | Turbo S Sedan | Electric Vehicle | |
| 2021 | Porsche | Taycan | 4S Turismo Wagon | Electric Vehicle | |
| 2023 | Porsche | Taycan | Turbo S Turismo Wagon | Electric Vehicle | |
| 2021 | Porsche | Taycan | 4S Sedan | Electric Vehicle | |
| 2023 | Porsche | Taycan | 4S Sedan | Electric Vehicle | |
| 2022 | Porsche | Taycan | Sedan | Electric Vehicle | |
| 2022 | Porsche | Taycan | 4 Turismo Wagon | Electric Vehicle | |
| 2022 | Porsche | Taycan | Turbo Sedan | Electric Vehicle | |
| 2021 | Porsche | Taycan | Turbo Turismo Wagon | Electric Vehicle | |
| 2022 | Porsche | Taycan | Turbo Turismo Wagon | Electric Vehicle | |
| 2022 | Porsche | Taycan | Turbo S Turismo Wagon | Electric Vehicle | |
| 2023 | Porsche | Taycan | GTS Turismo Wagon | Electric Vehicle | |
| 2020 | Porsche | Taycan | Turbo Sedan | Electric Vehicle | |
| 2021 | Porsche | Taycan | 4 Turismo Wagon | Electric Vehicle | |
| 2023 | Porsche | Taycan | 4S Turismo Wagon | Electric Vehicle | |
| 2021 | Porsche | Taycan | Turbo S Sedan | Electric Vehicle | |
| 2021 | Porsche | Taycan | Sedan | Electric Vehicle | |
| 2023 | Audi | e-tron | SUV | Electric Vehicle | For Vehicles with Production Date After 12/02/19 |
| 2021 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo | |
| 2022 | Audi | e-tron | SUV | Electric Vehicle | For Vehicles with Production Date After 12/02/19 |
| 2019 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2024 | Audi | e-tron GT | Sedan | Electric Vehicle | |
| 2020 | Audi | Q7 | SUV | 3.0L V6 Turbo | For Vehicles with Production Date After 11/24/19 |
| 2020 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo | |
| 2022 | Audi | Q7 | SUV | 3.0L V6 Turbo | For Vehicles with Production Date After 11/24/19 |
| 2020 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2023 | Audi | Q7 | SUV | 3.0L V6 Turbo | For Vehicles with Production Date After 11/24/19 |
| 2023 | Audi | e-tron S | SUV | Electric Vehicle | For Vehicles with Production Date After 12/02/19 |
| 2021 | Audi | Q7 | SUV | 3.0L V6 Turbo | For Vehicles with Production Date After 11/24/19 |
| 2023 | Audi | Q7 | SUV | 2.0L l4 Turbo | |
| 2023 | Audi | A6 | Quattro Sedan | 2.0L l4 Turbo | For Vehicles with Production Date After 02/22/21 |
| 2023 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo | |
| 2021 | Audi | e-tron | SUV | Electric Vehicle | For Vehicles with Production Date After 12/02/19 |
| 2022 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2022 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo | |
| 2022 | Audi | e-tron GT | Sedan | Electric Vehicle | |
| 2021 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2020 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2022 | Audi | e-tron S | SUV | Electric Vehicle | For Vehicles with Production Date After 12/02/19 |
| 2023 | Audi | e-tron GT | Sedan | Electric Vehicle | |
| 2020 | Audi | e-tron | SUV | Electric Vehicle | |
| 2023 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2022 | Audi | A6 | Quattro Sedan | 2.0L l4 Turbo | |
| 2021 | Audi | A6 | Quattro Sedan | 2.0L l4 Turbo | |
| 2021 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2019 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo |