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Genuine VW/Audi Voltage Regulator | 06F903803B

Audi A3, TT Quattro
VW Jetta, Passat, Golf, Beetle, GTI, Rabbit, Jetta V, CC, Tiguan AWD, Eos & more
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P/N: 06F903803B Genuine VW/Audi
Voltage Reg, Regulator
Included with new alternator.
Audi: A3. 2.0L, 2008-10, with awd, tts. TT. 2.0L, diesel, bosch. 2.5l. 2.0l tdi. For Bosch Alternator.
Your part is located within diagram as #6.
Cross References:
  • 06F903803
  • 06F903803A
  • 06F903803AX
  • VW06F903803B

Voltage regulators maintain a constant range of alternator voltage output and convert the alternate current (AC) produced by the alternator into the direct current (DC) the vehicle operates on. As the alternator turns, it uses coil windings and magnets to create the alternate current. The faster the alternator turns, the more current and voltage is produced. The voltage regulator uses diodes to convert the AC to DC, limiting the alternator's voltage output to 12-14 volts.

Voltage regulators fail when they can no longer convert alternate current to direct current or when they can no longer maintain a consistent voltage that the vehicle requires to operate.

Signs of a faulty voltage regulator include:
  • Surging lights
  • Flickering interior lights
  • Instrument cluster or panel malfunctioning
  • Battery light or check engine light illuminated
  • A battery not being charged

Checking battery voltage or alternator output are simple ways to test a voltage regulator. Fluctuating battery voltage or drops in alternator output when the engine is at idle indicates the voltage regulator has failed and is not regulating voltage or not converting alternate current to direct current.

Replacing Your Vehicle's Voltage Regulator

Some voltage regulators are external to the alternator and can be removed and replaced in series with the alternator output circuit. Other voltage regulators are mounted inside of the alternator and may be removable and replaceable, but some will require the replacement of the alternator to replace the voltage regulator.

View more Genuine VW/Audi Voltage Regulators.

Any Genuine brand part is obtained directly through our vehicle dealership network from your vehicle's manufacturer. This is always your best option for getting the exact same part that is being replaced and will be the latest version design.
Left = Driver side and Right = Passenger side.
All parts are priced individually unless identified as a set or kit. "Per car" notes identify how many of a given part your car has and "Left/Right or Front/Rear" notes means the part fits the left or right side of the car. These parts are still sold individually and you'll need to select the appropriate quantity if you plan to replace more than one of this item.

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What This Genuine VW/Audi Voltage Regulator Fits?

Application information below is for reference only and should not be used to determine the exact vehicle fitment. Please use the "Make Sure It Fits" vehicle selection box above to determine the exact fitment and review any application notes. If you need any help determining if this part works with your vehicle, please don't hesitate to contact us.

06-13 - A3 Base, TDI
09-13 - TT Quattro RS, S
00-16 - Beetle Base, 2.5, Classic, Denim, Dune & more
01-01 - Beetle TDI
Fuel Type: DIESEL
01-01 - Beetle
Fuel Type: GAS
09-16 - CC 4 Motion, Executive, Executive 4 Motion, Luxury, Sport & more
13-13 - CC Lux
Fuel Type: GAS
07-10 - Eos 3.2, Base, Komfort, Lux, Turbo & more
10-14 - Golf Base, TDI
12-13 - Golf R
06-09 - GTI Base, FAHRENHEIT
05-15 - Jetta Base, 2.5, GLI, GLI SE, GLI SEL & more
05-07 - Jetta V 2.0T, TDI, Value Edition
06-16 - Passat 2.0T, 3.6, Komfort, LUX, S & more
09-09 - Passat CC Luxury, Sport
08-08 - R32
06-09 - Rabbit 2.5, S
17-17 - Tiguan AWD S, SEL, Sport, Wolfsburg Edition
17-17 - Tiguan FWD S, SEL, Sport, Wolfsburg Edition
18-18 - Tiguan Limited AWD
18-18 - Tiguan Limited FWD