2004-2010 Audi A8/S8 Blower Motor Resistor 4E0820521B
OEM Part #: 4E0-820-521-B (4E0820521B)
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The exact part you’ll receive — not a stock photo.
$98.49
Used
Donor2008 Audi A8 · 4.2L
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Genuine OEM Used
SKU: 684270
Donor Vehicle: 2008 Audi A8 · 4.2L
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$98.49
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A used OEM Blower Motor Resistor for Audi, part number 4E0820521B, also supersedes 4E0820521A. This genuine component controls the HVAC fan speed in models like the A8 Quattro and S8 equipped with 4.2L V8, 5.2L V10, or 6.0L W12 engines. When this resistor fails, the blower motor often operates at only one speed—typically high—or stops working entirely. Restore full variable fan control with this salvaged OEM unit.
Specifications
| Fits Vehicle Model | A8, S8 |
| Fits Vehicle Make | Audi |
| OEM Part No | 4E0-820-521-B (4E0820521B) |
| Compatible OEM Part No | 4E0-820-521-A |
| Category | HVAC / Climate Control |
Compatible Vehicles
Fits 21 vehicle configurations across 1 make, 2004-2010.
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 21 vehicle configurations
| Year | Make | Model | Trim | Engine | Note |
|---|---|---|---|---|---|
| 2010 | Audi | A8 | Quattro L Sedan | 4.2L V8 | |
| 2008 | Audi | A8 | Quattro L Sedan | 6.0L W12 | |
| 2010 | Audi | A8 | Quattro Sedan | 4.2L V8 | |
| 2009 | Audi | A8 | Quattro L Sedan | 4.2L V8 | |
| 2006 | Audi | A8 | Quattro L Sedan | 6.0L W12 | |
| 2007 | Audi | A8 | Quattro L Sedan | 6.0L W12 | |
| 2004 | Audi | A8 | Quattro L Sedan | 4.2L V8 | |
| 2007 | Audi | S8 | Sedan | 5.2L V10 | |
| 2007 | Audi | A8 | Quattro L Sedan | 4.2L V8 | |
| 2005 | Audi | A8 | Quattro L Sedan | 6.0L W12 | |
| 2008 | Audi | A8 | Quattro Sedan | 4.2L V8 | |
| 2005 | Audi | A8 | Quattro Sedan | 4.2L V8 | |
| 2008 | Audi | A8 | Quattro L Sedan | 4.2L V8 | |
| 2006 | Audi | A8 | Quattro Sedan | 4.2L V8 | |
| 2006 | Audi | A8 | Quattro L Sedan | 4.2L V8 | |
| 2007 | Audi | A8 | Quattro Sedan | 4.2L V8 | |
| 2009 | Audi | S8 | Sedan | 5.2L V10 | |
| 2005 | Audi | A8 | Quattro L Sedan | 4.2L V8 | |
| 2009 | Audi | A8 | Quattro Sedan | 4.2L V8 | |
| 2009 | Audi | A8 | Quattro L Sedan | 6.0L W12 | |
| 2008 | Audi | S8 | Sedan | 5.2L V10 |