Genuine Audi Voltage Regulators

Alternator Regulators

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37 Voltage Regulators found

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Audi Voltage Regulator Part Number: 038-903-803-K
$72.00 MSRP: $100.83
You Save: $28.83 (29%)
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Product Specifications
- Other Name: Regulator
- Replaces: 078-903-803-C, 038-903-803-J, 06B-903-803
Fits the following Audi Models:
- A6 | 1998-2001 | Base | 6 Cyl 2.8 L GAS
- A6 Quattro | 1998-2004 | Avant, Base | 6 Cyl 2.7 L GAS, 6 Cyl 2.8 L GAS
- Allroad Quattro | 2003-2004 | Base | 6 Cyl 2.7 L GAS
- TT | 2000-2006 | Base | 4 Cyl 1.8 L GAS
- TT Quattro | 2000-2006 | ALMS Edition, Base, Special Edition | 4 Cyl 1.8 L GAS, 6 Cyl 3.2 L GAS
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Audi Voltage Regulator Part Number: 078-903-803-A
$100.67 MSRP: $141.00
You Save: $40.33 (29%)
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Product Specifications
- Other Name: Regulator
Fits the following Audi Models:
- 100 | 1992-1994 | Base, CS, S | 6 Cyl 2.8 L GAS
- 100 Quattro | 1992-1994 | CS | 6 Cyl 2.8 L GAS
- A6 | 1995-1998 | Avant, Base | 6 Cyl 2.8 L GAS
- A6 Quattro | 1995-1998 | Avant, Base | 6 Cyl 2.8 L GAS
- S4 | 1992-1994 | Base | 5 Cyl 2.2 L GAS
- S6 | 1995 | Avant, Base | 5 Cyl 2.2 L GAS
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Audi Voltage Regulator Part Number: 028-903-803-FX
$89.57 MSRP: $125.00
You Save: $35.43 (29%)
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Product Specifications
- Other Name: Regulator
- Replaces: 028-903-803-F
Fits the following Audi Models:
- A4 | 1996-2001 | Avant, Base | 6 Cyl 2.8 L GAS
- Cabriolet | 1994-1998 | Base | 6 Cyl 2.8 L GAS
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Audi Voltage Regulator Part Number: 038-903-803-E
$105.01 MSRP: $147.07
You Save: $42.06 (29%)
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Product Specifications
- Other Name: Regulator; Voltage Regulator
- Replaces: 038-903-803-EX
Fits the following Audi Models:
- A4 | 2007-2009, 2002-2004 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS
- A4 Quattro | 2002-2004 | Avant, Base | 4 Cyl 1.8 L GAS, 6 Cyl 3.0 L GAS
- A6 Quattro | 2000-2004 | Base | 6 Cyl 2.7 L GAS, 8 Cyl 4.2 L GAS
- S6 | 2002-2003 | Avant | 8 Cyl 4.2 L GAS
- TT | 2000-2006 | Base | 4 Cyl 1.8 L GAS
- TT Quattro | 2000-2006 | ALMS Edition, Base, Special Edition | 4 Cyl 1.8 L GAS, 6 Cyl 3.2 L GAS
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Audi Voltage Regulator Part Number: 06H-903-803-G
$85.67 MSRP: $119.99
You Save: $34.32 (29%)
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Product Specifications
- Other Name: Regulator; Voltage Regulator
- Replaces: 06H-903-803-C, 06H-903-803
Fits the following Audi Models:
- A6 | 2012 | Premium, Premium Plus | 4 Cyl 2.0 L GAS
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Audi Voltage Regulator Part Number: 068-903-803-DX
$123.17 MSRP: $172.07
You Save: $48.90 (29%)
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Product Specifications
- Other Name: Regulator
- Replaces: 068-903-803-B, 068-903-803-D
Fits the following Audi Models:
- 4000 | 1985-1987 | S | 4 Cyl 1.8 L GAS
- 4000 Quattro | 1984-1987 | CS, S | 5 Cyl 2.2 L GAS
- 5000 | 1984-1988 | CS, CS Turbo, S, S Turbo | 5 Cyl 2.2 L GAS, 5 Cyl 2.3 L GAS
- 5000 Quattro | 1986-1988 | CS, S | 5 Cyl 2.2 L GAS, 5 Cyl 2.3 L GAS
- 80 | 1988-1992 | Base | 4 Cyl 2.0 L GAS, 5 Cyl 2.3 L GAS
- 80 Quattro | 1988-1992 | Base | 5 Cyl 2.3 L GAS
- 90 | 1988-1991 | Base | 4 Cyl 2.0 L GAS, 5 Cyl 2.3 L GAS
- 90 Quattro | 1988-1991 | 20v, Base | 5 Cyl 2.3 L GAS
- A6 | 1995 | Avant, Base | 6 Cyl 2.8 L GAS
- A6 Quattro | 1995 | Avant, Base | 6 Cyl 2.8 L GAS
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Audi Voltage Regulator Part Number: 079-903-803-G
$208.24 MSRP: $291.65
You Save: $83.41 (29%)
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Product Specifications
- Other Name: Regulator
- Replaces: 079-903-803-E
Fits the following Audi Models:
- A8 Quattro | 2011-2012 | Base, L, L W12 | 12 Cyl 6.3 L GAS, 8 Cyl 4.2 L GAS
- RS5 | 2013-2015 | Base, Cabriolet | 8 Cyl 4.2 L GAS
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Audi Voltage Regulator Part Number: 028-903-803-E
$145.18 MSRP: $203.33
You Save: $58.15 (29%)
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Product Specifications
- Other Name: Regulator
Fits the following Audi Models:
- A4 | 1997-2001 | Avant, Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS
- A4 Quattro | 1997-2001 | Avant, Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS
- A6 Quattro | 2000-2004 | Base | 8 Cyl 4.2 L GAS
- A8 | 1997-1999 | Base | 8 Cyl 3.7 L GAS
- A8 Quattro | 1997-2003 | Base, L | 8 Cyl 4.2 L GAS
- Allroad Quattro | 2001-2002 | Base | 6 Cyl 2.7 L GAS
- S6 | 2002-2003, 1995 | Avant, Base | 5 Cyl 2.2 L GAS, 8 Cyl 4.2 L GAS
- S8 | 2001-2003 | Base | 8 Cyl 4.2 L GAS
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Audi Voltage Regulator Part Number: 038-903-803-F
$145.18 MSRP: $203.33
You Save: $58.15 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Regulator
Fits the following Audi Models:
- A4 | 2000-2002 | Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS, 6 Cyl 3.0 L GAS
- A4 Quattro | 2000-2002 | Avant, Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS, 6 Cyl 3.0 L GAS
- A6 | 2000-2001 | Base | 6 Cyl 2.8 L GAS
- A6 Quattro | 2000-2001 | Avant, Base | 6 Cyl 2.8 L GAS
- S4 | 2000-2002 | Avant, Base | 6 Cyl 2.7 L GAS
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Audi Voltage Regulator Part Number: 03L-903-803-D
$216.57 MSRP: $303.32
You Save: $86.75 (29%)
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Product Specifications
- Other Name: Regulator
- Replaces: 06E-903-803-G
Fits the following Audi Models:
- Q5 | 2009-2012 | Premium, Premium Plus, Prestige | 6 Cyl 3.2 L GAS
- TT Quattro | 2011-2015 | Base, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
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Audi Voltage Regulator Part Number: 03L-903-803-C
$61.48 MSRP: $86.10
You Save: $24.62 (29%)
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Product Specifications
- Other Name: Regulator
- Replaces: 059-903-803-M
Fits the following Audi Models:
- Q3 | 2015 | Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- Q3 Quattro | 2015 | Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- TT Quattro | 2011-2015 | Base, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
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Audi Voltage Regulator Part Number: 070-903-803-E
$237.99 MSRP: $333.32
You Save: $95.33 (29%)
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Product Specifications
- Other Name: Regulator
- Replaces: 078-903-803-E, 078-903-803-EX, 070-903-803-B
Fits the following Audi Models:
- A3 | 2009-2013 | Base, TDI | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
- A3 Quattro | 2009-2013 | Base | 4 Cyl 2.0 L GAS
- TT | 2009, 2000-2006 | Base | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
- TT Quattro | 2009-2010, 2000-2006 | ALMS Edition, Base, Special Edition | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
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Audi Voltage Regulator Part Number: 06H-903-803-E
$188.01 MSRP: $263.31
You Save: $75.30 (29%)
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Product Specifications
- Other Name: Regulator
- Replaces: 06H-903-803-B
Fits the following Audi Models:
- A4 | 2013-2016 | Base, Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- A4 Quattro | 2013-2016 | Base, Premium, Premium Plus, Prestige | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS
- A5 | 2013-2014 | Cabriolet | 4 Cyl 2.0 L GAS
- A5 Quattro | 2013-2017 | Base, Cabriolet, Premium, Premium Plus, Prestige, Sport | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS
- S4 | 2013-2016 | Base, Premium Plus, Prestige | 6 Cyl 3.0 L GAS
- S5 | 2013-2017 | Base, Premium Plus, Prestige | 6 Cyl 3.0 L GAS
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Audi Voltage Regulator Part Number: 07K-903-803
$252.86 MSRP: $354.15
You Save: $101.29 (29%)
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Product Specifications
- Other Name: Regulator
- Replaces: 06E-903-803-F
Fits the following Audi Models:
- A4 | 2009-2012 | Base | 4 Cyl 2.0 L GAS
- A4 Quattro | 2009-2012 | Avant, Base | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- A5 | 2010-2012 | Cabriolet | 4 Cyl 2.0 L GAS
- A5 Quattro | 2010-2012 | Base, Cabriolet | 4 Cyl 2.0 L GAS
- Q5 | 2009-2012 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- S4 | 2010-2012 | Base | 6 Cyl 3.0 L GAS
- TT Quattro | 2011-2015 | Base, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- TT RS Quattro | 2012-2013 | Base | 5 Cyl 2.5 L GAS
- TTS Quattro | 2011-2015 | Base | 4 Cyl 2.0 L GAS
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Audi Voltage Regulator Part Number: 06F-903-803-B
$255.84 MSRP: $358.32
You Save: $102.48 (29%)
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Product Specifications
- Other Name: Regulator
- Replaces: 06F-903-803, 06F-903-803-AX, 06F-903-803-A
Fits the following Audi Models:
- A3 | 2006-2013 | Base, TDI | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
- A3 Quattro | 2006-2010 | Base | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- TT RS Quattro | 2012-2013 | Base | 5 Cyl 2.5 L GAS
- TTS Quattro | 2009-2010 | Base | 4 Cyl 2.0 L GAS
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Audi Voltage Regulator Part Number: 077-903-803-A
$196.35 MSRP: $275.00
You Save: $78.65 (29%)
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Product Specifications
- Other Name: Regulator
Fits the following Audi Models:
- Q7 | 2008 | Base, Premium | 6 Cyl 3.6 L GAS, 8 Cyl 4.2 L GAS
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Audi Voltage Regulator Part Number: 06E-903-803-T
$249.29 MSRP: $349.15
You Save: $99.86 (29%)
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Product Specifications
- Other Name: Regulator
- Replaces: 06E-903-803-H, 06H-903-803-A
Fits the following Audi Models:
- A5 Quattro | 2008-2010 | Base | 6 Cyl 3.2 L GAS
- A6 | 2012-2015 | Premium, Premium Plus | 4 Cyl 2.0 L GAS
- A6 Quattro | 2013-2015 | Premium, Premium Plus | 4 Cyl 2.0 L GAS
- Q5 | 2009-2012 | Premium, Premium Plus, Prestige | 6 Cyl 3.2 L GAS
- S4 | 2010-2012 | Base | 6 Cyl 3.0 L GAS
- S5 | 2010-2016 | Base, Cabriolet, Premium Plus, Prestige | 6 Cyl 3.0 L GAS
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Audi Voltage Regulator Part Number: 028-903-803-DX
$221.33 MSRP: $309.99
You Save: $88.66 (29%)
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Product Specifications
- Other Name: Regulator; Voltage Regulator
- Replaced by: 028-903-803-D
Fits the following Audi Models:
- 100 | 1992-1994 | Base, CS, S | 6 Cyl 2.8 L GAS
- 100 Quattro | 1992-1994 | CS | 6 Cyl 2.8 L GAS
- 80 | 1992 | Base | 5 Cyl 2.3 L GAS
- 80 Quattro | 1992 | Base | 5 Cyl 2.3 L GAS
- 90 | 1993-1995 | Base, CS, S, Sport | 6 Cyl 2.8 L GAS
- 90 Quattro | 1993-1995 | Base, CS, Sport | 6 Cyl 2.8 L GAS
- A4 | 1996-2001 | Avant, Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS
- A4 Quattro | 1996-2001 | Avant, Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS
- A6 | 1995-1999 | Avant, Base | 6 Cyl 2.8 L GAS
- A6 Quattro | 1995-1999 | Avant, Base | 6 Cyl 2.8 L GAS
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Audi Voltage Regulator Part Number: 059-903-803-N
$243.94 MSRP: $341.65
You Save: $97.71 (29%)
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Product Specifications
- Other Name: Regulator
- Replaces: 06E-903-803-S
Fits the following Audi Models:
- A4 | 2013-2016 | Base, Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
- A4 Quattro | 2013-2016 | Base, Premium, Premium Plus, Prestige | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS
- A5 | 2013-2014 | Cabriolet | 4 Cyl 2.0 L GAS
- A5 Quattro | 2013-2017 | Base, Cabriolet, Premium, Premium Plus, Prestige, Sport | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L GAS
- A6 | 2012-2013 | Premium, Premium Plus | 4 Cyl 2.0 L GAS
- A6 Quattro | 2013 | Premium, Premium Plus | 4 Cyl 2.0 L GAS
- A7 Quattro | 2012-2017 | Base, Competition, Premium Plus, Prestige | 6 Cyl 3.0 L GAS
- S4 | 2013-2016 | Base, Premium Plus, Prestige | 6 Cyl 3.0 L GAS
- S5 | 2013-2017 | Base, Cabriolet, Premium Plus, Prestige | 6 Cyl 3.0 L GAS
- allroad | 2013-2016 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L FLEX
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Audi Voltage Regulator Part Number: 06B-903-803-B
$300.46 MSRP: $420.82
You Save: $120.36 (29%)
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Product Specifications
- Other Name: Regulator
- Replaces: 5U0-903-803-A, 03C-903-803, 06B-903-803-A
Fits the following Audi Models:
- A3 | 2006-2013 | Base, TDI | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
- A3 Quattro | 2009-2013, 2006-2007 | Base | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- A4 | 2003-2009 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
- A4 Quattro | 2005-2008 | Avant, Base | 4 Cyl 2.0 L GAS
- TT | 2008-2009 | Base | 4 Cyl 2.0 L GAS
- TT Quattro | 2008-2010 | Base | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
- TTS Quattro | 2009 | Base | 4 Cyl 2.0 L GAS
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Audi Voltage Regulators

Audi Voltage Regulators protect the electrical system by maintaining the alternator output in the safe range of 13.5 to 14.5 volts, which will prevent flickering lights or damaged electronics. Audi as a brand is unique for combining a sleek design, quattro all-wheel drive, and cockpit tech, which makes every trip a connected one. Its history since 1909 demonstrates a drive towards innovation, from the rally-winning turbo engines to modern e-tron electric models. Drivers enjoy the way an Audi feels on wet roads, the way matrix headlights cut through the dark, or the way the virtual cockpit puts important information directly in front of them. These characteristics create trust in every segment, from compact cars to spacious SUVs, and create expectations of reliable power delivery under the hood. To deliver on that promise, Voltage Regulators are working silently in each alternator, reading battery charge and cabin demand in milliseconds, then increasing or decreasing rotor current so energy flows smoothly to the lights, infotainment, and control modules. Modern solid-state Voltage Regulators switch thousands of times per second for crisp response, replacing older mechanical points that could stick and overcharge. By reducing stress on the battery, they increase service life and contribute to the seamless tech that defines Audi today. With their compact design and universal compatibility across the lineup, Voltage Regulators are a key part of stable performance whenever an Audi leaves the driveway.

Stick with genuine OEM Voltage Regulators when you need quality that holds up. Audi crafts these parts to hit strict factory specs for every single unit. They also run each part through rigorous checks during production to maintain high quality. You can find exact Audi Voltage Regulators you need in our huge stock at AudiPartsGiant.com. You'll love our low, economical prices too. Every OEM part carries a real manufacturer's warranty, so you can buy with confidence. Returns aren't a headache here because our policy is simple. Plus, our speedy delivery gets orders out fast. Shop today and buy with total peace of mind.