2017-2026 Audi / Porsche Blower Motor Resistor 4M0820521
OEM Part #: 4M0-820-521 (4M0820521)
Actual photo
The exact part you’ll receive — not a stock photo.
$23.99
Used
Donor2018 Audi Q7 · 2.0L
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Genuine OEM Used
SKU: 598076
Donor Vehicle: 2018 Audi Q7 · 2.0L
2 photos
$23.99
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Genuine OEM Used
SKU: 532484
Donor Vehicle: 2017 Audi Q7 · 3.0L
2 photos
$23.99
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Genuine OEM Used
SKU: 588447
Donor Vehicle: 2018 Audi Q7 · 3.0L
2 photos
$23.99
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Genuine OEM Used
SKU: 607122
Donor Vehicle: 2017 Audi Q7 · 3.0L
2 photos
$23.99
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Genuine OEM Used
SKU: 700777
Donor Vehicle: 2021 Audi SQ8 · 4.0L · 47k miles
2 photos
$23.99
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Audi Blower Motor Resistor, OEM part number 4M0820521, is a genuine used component from a donor vehicle. This resistor controls the fan speed for the HVAC blower motor; when it fails, you may experience only one fan speed or no airflow at all. It fits Audi A8, Q7, Q8, RS Q8, S8, SQ7, SQ8, and Porsche Cayenne models with engines including the 2.0L turbo four, 2.9L V6, 3.0L diesel, and various 3.0L V6 gas or hybrid configurations.
Specifications
| Fits Vehicle Model | A8, Cayenne, Q7, Q8, RS Q8, S8, SQ7, SQ8 |
| Fits Vehicle Make | Audi, Porsche |
| OEM Part No | 4M0-820-521 (4M0820521) |
| Category | HVAC / Climate Control |
Compatible Vehicles
Fits 124 vehicle configurations across 2 makes, 2017-2026.
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 124 vehicle configurations — 15 with fitment notes
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2026 | Audi | Q8 | SUV | 3.0L V6 Turbo | |
| 2026 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2026 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo | |
| 2025 | Audi | RS Q8 | SUV | 4.0L V8 Turbo | |
| 2026 | Audi | RS Q8 | SUV | 4.0L V8 Turbo | |
| 2026 | Audi | SQ8 | SUV | 4.0L V8 Turbo | |
| 2021 | Audi | SQ8 | SUV | 4.0L V8 Turbo | For Auxiliary HVAC |
| 2025 | Audi | Q8 | SUV | 3.0L V6 Turbo | For Auxiliary HVAC |
| 2025 | Audi | S8 | Sedan | 4.0L V8 Turbo | For Auxiliary HVAC |
| 2025 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo | For Auxiliary HVAC |
| 2025 | Audi | SQ8 | SUV | 4.0L V8 Turbo | For Auxiliary HVAC |
| 2024 | Audi | SQ7 | SUV | 4.0L V8 Turbo | For Auxiliary HVAC |
| 2024 | Audi | SQ8 | SUV | 4.0L V8 Turbo | For Auxiliary HVAC |
| 2025 | Audi | SQ7 | SUV | 4.0L V8 Turbo | For Auxiliary HVAC |
| 2022 | Audi | SQ8 | SUV | 4.0L V8 Turbo | For Auxiliary HVAC |
| 2022 | Audi | SQ7 | SUV | 4.0L V8 Turbo | For Auxiliary HVAC |
| 2023 | Audi | SQ7 | SUV | 4.0L V8 Turbo | For Auxiliary HVAC |
| 2023 | Audi | SQ8 | SUV | 4.0L V8 Turbo | For Auxiliary HVAC |
| 2020 | Audi | SQ7 | SUV | 4.0L V8 Turbo | For Auxiliary HVAC |
| 2020 | Audi | SQ8 | SUV | 4.0L V8 Turbo | For Auxiliary HVAC |
| 2021 | Audi | SQ7 | SUV | 4.0L V8 Turbo | For Auxiliary HVAC |
| 2025 | Audi | Q7 | SUV | 3.0L V6 Turbo | |
| 2025 | Audi | Q7 | SUV | 2.0L l4 Turbo | |
| 2026 | Audi | Q7 | SUV | 2.0L l4 Turbo | |
| 2026 | Audi | Q7 | SUV | 3.0L V6 Turbo | |
| 2023 | Porsche | Cayenne | S Coupe SUV | 2.9L V6 Turbo | |
| 2022 | Porsche | Cayenne | SUV | 3.0L V6 Turbo | |
| 2024 | Porsche | Cayenne | SUV | 3.0L V6 Turbo | |
| 2024 | Porsche | Cayenne | Coupe SUV | 3.0L V6 Turbo | |
| 2024 | Porsche | Cayenne | S Coupe SUV | 4.0L V8 Turbo | |
| 2024 | Porsche | Cayenne | S Coupe SUV | 3.0L V6 Turbo | |
| 2021 | Porsche | Cayenne | GTS Coupe SUV | 4.0L V8 Turbo | |
| 2024 | Porsche | Cayenne | Turbo SUV | 4.0L V8 Turbo | |
| 2021 | Porsche | Cayenne | S SUV | 2.9L V6 Turbo | |
| 2020 | Porsche | Cayenne | S SUV | 2.9L V6 Turbo | |
| 2021 | Porsche | Cayenne | Turbo S SUV | 4.0L V8 Turbo | |
| 2021 | Porsche | Cayenne | Turbo Coupe SUV | 4.0L V8 Turbo | |
| 2024 | Porsche | Cayenne | Turbo GT Coupe SUV | 4.0L V8 Turbo | |
| 2021 | Porsche | Cayenne | GTS SUV | 4.0L V8 Turbo | |
| 2023 | Porsche | Cayenne | Turbo S SUV | 4.0L V8 Turbo | |
| 2023 | Porsche | Cayenne | Coupe SUV | 3.0L V6 Turbo | |
| 2023 | Porsche | Cayenne | SUV | 3.0L V6 Turbo | |
| 2023 | Porsche | Cayenne | Turbo GT Coupe SUV | 4.0L V8 Turbo | |
| 2020 | Porsche | Cayenne | Turbo S Coupe SUV | 4.0L V8 Turbo | |
| 2020 | Porsche | Cayenne | SUV | 3.0L V6 Turbo | |
| 2022 | Porsche | Cayenne | S SUV | 2.9L V6 Turbo | |
| 2019 | Porsche | Cayenne | SUV | 3.0L V6 Turbo | |
| 2018 | Porsche | Cayenne | SUV | 3.6L V6 | |
| 2018 | Porsche | Cayenne | S SUV | 3.6L V6 Turbo | |
| 2018 | Porsche | Cayenne | Turbo SUV | 4.8L V8 Turbo | |
| 2018 | Porsche | Cayenne | GTS SUV | 3.6L V6 Turbo | |
| 2018 | Porsche | Cayenne | S SUV | 3.0L V6 Supercharged | |
| 2018 | Porsche | Cayenne | Turbo S SUV | 4.8L V8 Turbo | |
| 2019 | Porsche | Cayenne | Turbo SUV | 4.0L V8 Turbo | |
| 2019 | Porsche | Cayenne | S SUV | 2.9L V6 Turbo | |
| 2020 | Porsche | Cayenne | Coupe SUV | 3.0L V6 Turbo | |
| 2020 | Porsche | Cayenne | S Coupe SUV | 2.9L V6 Turbo | |
| 2020 | Porsche | Cayenne | Turbo SUV | 4.0L V8 Turbo | |
| 2020 | Porsche | Cayenne | Turbo Coupe SUV | 4.0L V8 Turbo | |
| 2020 | Porsche | Cayenne | Turbo S SUV | 4.0L V8 Turbo | |
| 2023 | Porsche | Cayenne | Turbo Coupe SUV | 4.0L V8 Turbo | |
| 2022 | Porsche | Cayenne | S Coupe SUV | 2.9L V6 Turbo | |
| 2023 | Porsche | Cayenne | S SUV | 2.9L V6 Turbo | |
| 2021 | Porsche | Cayenne | SUV | 3.0L V6 Turbo | |
| 2022 | Porsche | Cayenne | Coupe SUV | 3.0L V6 Turbo | |
| 2021 | Porsche | Cayenne | Turbo S Coupe SUV | 4.0L V8 Turbo | |
| 2023 | Porsche | Cayenne | GTS SUV | 4.0L V8 Turbo | |
| 2022 | Porsche | Cayenne | Turbo GT Coupe SUV | 4.0L V8 Turbo | |
| 2022 | Porsche | Cayenne | Turbo SUV | 4.0L V8 Turbo | |
| 2021 | Porsche | Cayenne | Turbo SUV | 4.0L V8 Turbo | |
| 2022 | Porsche | Cayenne | Turbo S Coupe SUV | 4.0L V8 Turbo | |
| 2023 | Porsche | Cayenne | GTS Coupe SUV | 4.0L V8 Turbo | |
| 2021 | Porsche | Cayenne | S Coupe SUV | 2.9L V6 Turbo | |
| 2023 | Porsche | Cayenne | Turbo S Coupe SUV | 4.0L V8 Turbo | |
| 2021 | Porsche | Cayenne | Coupe SUV | 3.0L V6 Turbo | |
| 2022 | Porsche | Cayenne | Turbo Coupe SUV | 4.0L V8 Turbo | |
| 2022 | Porsche | Cayenne | Turbo S SUV | 4.0L V8 Turbo | |
| 2024 | Porsche | Cayenne | S SUV | 4.0L V8 Turbo | |
| 2024 | Porsche | Cayenne | S SUV | 3.0L V6 Turbo | |
| 2022 | Porsche | Cayenne | GTS SUV | 4.0L V8 Turbo | |
| 2022 | Porsche | Cayenne | GTS Coupe SUV | 4.0L V8 Turbo | |
| 2023 | Porsche | Cayenne | Turbo SUV | 4.0L V8 Turbo | |
| 2024 | Porsche | Cayenne | Turbo Coupe SUV | 4.0L V8 Turbo | |
| 2022 | Audi | Q7 | SUV | 2.0L l4 Turbo | |
| 2024 | Audi | Q7 | SUV | 2.0L l4 Turbo | |
| 2021 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2021 | Audi | Q8 | SUV | 3.0L V6 Turbo | |
| 2023 | Audi | Q7 | SUV | 2.0L l4 Turbo | |
| 2024 | Audi | RS Q8 | SUV | 4.0L V8 Turbo | |
| 2023 | Audi | Q7 | SUV | 3.0L V6 Turbo | |
| 2022 | Audi | Q7 | SUV | 3.0L V6 Turbo | |
| 2023 | Audi | RS Q8 | SUV | 4.0L V8 Turbo | |
| 2024 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo | |
| 2023 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2021 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo | |
| 2022 | Audi | RS Q8 | SUV | 4.0L V8 Turbo | |
| 2024 | Audi | Q7 | SUV | 3.0L V6 Turbo | |
| 2024 | Audi | Q8 | SUV | 3.0L V6 Turbo | |
| 2023 | Audi | Q8 | SUV | 3.0L V6 Turbo | |
| 2024 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2021 | Audi | Q7 | SUV | 2.0L l4 Turbo | |
| 2021 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2022 | Audi | Q8 | SUV | 3.0L V6 Turbo | |
| 2022 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo | |
| 2021 | Audi | Q7 | SUV | 3.0L V6 Turbo | |
| 2021 | Audi | RS Q8 | SUV | 4.0L V8 Turbo | |
| 2022 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2023 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo | |
| 2020 | Audi | RS Q8 | SUV | 4.0L V8 Turbo | |
| 2020 | Audi | Q8 | SUV | 3.0L V6 Turbo | |
| 2019 | Audi | Q7 | SUV | 2.0L l4 Turbo | |
| 2020 | Audi | Q7 | SUV | 2.0L l4 Turbo | |
| 2018 | Audi | Q7 | SUV | 2.0L l4 Turbo | |
| 2018 | Audi | Q7 | SUV | 3.0L V6 Supercharged | |
| 2017 | Audi | Q7 | SUV | 2.0L l4 Turbo | |
| 2020 | Audi | Q7 | SUV | 3.0L V6 Turbo | |
| 2017 | Audi | Q7 | SUV | 3.0L V6 Supercharged | |
| 2019 | Audi | Q7 | SUV | 3.0L V6 Supercharged | |
| 2019 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo | |
| 2020 | Audi | S8 | Sedan | 4.0L V8 Turbo | |
| 2020 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2020 | Audi | A8 | Quattro L Sedan | 3.0L V6 Turbo | |
| 2019 | Audi | A8 | Quattro L Sedan | 4.0L V8 Turbo | |
| 2019 | Audi | Q8 | SUV | 3.0L V6 Turbo |