How does the Fuse Box safeguard the electrical circuits and what steps should be taken when a fuse or circuit breaker fails on Audi A4?

The electrical circuits of the vehicle are protected by a combination of fuses, circuit breakers and fusible links, main fuse/relay panel is situated in the engine compartment and the interior panel is situated in the passenger compartment. Fuses with different sizes are used; there are small, medium, and large-size fuses with the same design of the blade terminal; medium and large fuses can be removed by hand, but small ones should be pulled by hand using a pliers or fuse-puller tool made of plastic. Where an electrical component fails, it is important to check the fuse first, with a test light to check that power is present at the terminal tips, where no power is present, the fuse is blown, which can also visually be verified by observing the element between the terminal tips. Replacement fuses must be of the proper type as despite any physical similarity, replacement with a fuse of another rating is inadvisable because of the particular protection requirements of each circuit. When replacement fuse breaks immediately, because that underlying problem is usually a short circuit caused by broken wiring, the underlying problem should be fixed before more replacements. Other circuits have fusible links to protect them, which are meant to melt in excessive current flow, replacing a melted fusible link should be with another of the same specification, and troubling deficiencies of the circuit should be tracked down. Circuit breakers are designed to protect certain circuits (which can include power windows or heated seats) and may detect an overload and automatically reset after cutting power; and will provide a temporary fault clearing before re-energizing the circuit, it is important to note that the circuit does not restart after resetting, and close examination is required. To perform basic checks, the circuit breaker can be tilted slightly out of its socket to measure with a voltmeter to verify that there is battery voltage at both terminals, where no voltage is present, that the circuit breaker must be replaced, and that the circuit breaker may need to be reset by hand.

Genuine Audi A4 Fuse Box

Fuse Holder Box

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12 Fuse Boxes found

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Audi A4 Relay & Fuse Plate Part Number: 8K1-937-503
$43.18 MSRP: $59.49
You Save: $16.31 (28%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Plate; Relay Plate
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2009-2012 Audi A4 | Base | 4 Cyl 2.0 L GAS
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Audi A4 Relay & Fuse Plate Part Number: 8K1-937-503-B
$23.99 MSRP: $38.38
You Save: $14.39 (38%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Plate; Relay Plate
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2013-2016 Audi A4 | Base, Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
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Audi A4 Fuse Holder Part Number: 8K0-941-824-D
$30.00 MSRP: $48.00
You Save: $18.00 (38%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Holder; Fuse Box
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2017-2020 Audi A4 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS
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Audi A4 Relay & Fuse Plate Part Number: 4A0-941-822
$203.49 MSRP: $285.00
You Save: $81.51 (29%)
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Product Specifications
- Other Name: Plate; Relay Plate
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1996-1999 Audi A4 | Avant, Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS
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Audi A4 Relay & Fuse Plate Part Number: 8W0-971-845-AH
$52.62 MSRP: $72.48
You Save: $19.86 (28%)
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Product Specifications
- Other Name: Mounting; Mount Plate
- Replaces: 8W0-971-845
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2017-2020 Audi A4 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS
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Audi A4 Relay & Fuse Plate Part Number: 8E1-937-503-B
$14.61 MSRP: $19.49
You Save: $4.88 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Bracket
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2005-2008 Audi A4 | Base | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
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Audi A4 Relay & Fuse Plate Part Number: 8W0-971-845-AJ
$35.11 MSRP: $46.82
You Save: $11.71 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Mounting; Mount Plate
- Replaces: 8W0-971-845-A
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2017-2020 Audi A4 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS
View related parts
Audi A4 Relay & Fuse Plate Part Number: 8E0-937-503
$15.31 MSRP: $24.50
You Save: $9.19 (38%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Plate
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2007-2009, 2002-2005 Audi A4 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS
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Audi A4 Fuse Box Part Number: 8D1-941-824
$123.75 MSRP: $173.32
You Save: $49.57 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Holder
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1996-2009 Audi A4 | Avant, Base, Cabriolet | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS, 6 Cyl 3.0 L GAS
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Audi A4 Relay & Fuse Plate Part Number: 8L0-941-822-A
$290.36 MSRP: $406.67
You Save: $116.31 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Plate; Relay Plate
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2000-2001 Audi A4 | Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS
View related parts
Audi A4 Relay & Fuse Plate Part Number: 8K0-971-845-A
$48.39 MSRP: $66.66
You Save: $18.27 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Mounting
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2009-2016 Audi A4 | Base, Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
View related parts
Audi A4 Relay & Fuse Plate Part Number: 8W0-971-845-G
$23.24 MSRP: $30.99
You Save: $7.75 (26%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Mounting; Bracket, Mount, Mount Plate
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2017-2020 Audi A4 | Premium, Premium Plus, Prestige, Titanium | 4 Cyl 2.0 L GAS

Audi A4 Fuse Box

The Fuse Box of the Audi A4 shielded every vital circuit that instantly cut the power in case of surges, allowing reliable electronics on daily drives or road trips. This Fuse Box is housed in a compact plastic enclosure that accepts any automotive fuse rated for 32 volts and special 42-volt links. Lights, infotainment units, and power locks stay functioning optimally, while heat does not damage delicate wiring. Today's Audi models run one unit under the hood and one under the dashboard, shortening cable runs and placing high draw systems close to the battery. Earlier A4 generations only applied a single cabin unit, a legacy design still fully supported by the current Fuse Box. Any generation of the A4 sedan or wagon is compatible, meaning an owner can simply swap in a fresh unit without any rewiring. That would restore factory reliability in an instant. Audi enthusiasts appreciate the plug-and-play design that makes upgrades easy, and savvy Audi drivers enjoy spare slots for future components, along with resettable circuit breakers to replace throwaway fuses. The optional ignition-off draw position stops battery drain while parked for long periods. These attributes make the Fuse Box a performance upgrade that often goes unnoticed. Stable voltage results in faster ECU responses, brighter headlamps, crisper audio, and more. The driving feel thus reflects the real essence of the car. Safety also improves because if a fuse blows, it isolates the fault before wiring can be burnt or multiple systems disabled. The driver gets immediate feedback since the fuse is well labeled and at easy reach. Thanks to the brand's rigorous component standards, this Audi component is known for its durability and gives enthusiasts confidence when efficiency and safety are prime.

Choose original equipment manufacturer Fuse Box for great performance and strong durability. They use Audi's official craftsmanship and high-grade materials, and meet strict quality standards. Are you looking for quality Fuse Box at a good price? Come to our online store. We carry a wide range of genuine parts for your Audi A4 and the prices are competitive. Each part comes with the manufacturer's warranty. You can install with confidence and get steady results. Over time, you'll save money and avoid hassle. Keep your maintenance simple and protect your vehicle with OEM parts. Get the quality your A4 needs now.

Audi A4 Fuse Box Parts and Q&A

Fuse Box
8D1-941-824
Q:
How does the Fuse Box safeguard the electrical circuits and what steps should be taken when a fuse or circuit breaker fails on Audi A4?
A:
The electrical circuits of the vehicle are protected by a combination of fuses, circuit breakers and fusible links, main fuse/relay panel is situated in the engine compartment and the interior panel is situated in the passenger compartment. Fuses with different sizes are used; there are small, medium, and large-size fuses with the same design of the blade terminal; medium and large fuses can be removed by hand, but small ones should be pulled by hand using a pliers or fuse-puller tool made of plastic. Where an electrical component fails, it is important to check the fuse first, with a test light to check that power is present at the terminal tips, where no power is present, the fuse is blown, which can also visually be verified by observing the element between the terminal tips. Replacement fuses must be of the proper type as despite any physical similarity, replacement with a fuse of another rating is inadvisable because of the particular protection requirements of each circuit. When replacement fuse breaks immediately, because that underlying problem is usually a short circuit caused by broken wiring, the underlying problem should be fixed before more replacements. Other circuits have fusible links to protect them, which are meant to melt in excessive current flow, replacing a melted fusible link should be with another of the same specification, and troubling deficiencies of the circuit should be tracked down. Circuit breakers are designed to protect certain circuits (which can include power windows or heated seats) and may detect an overload and automatically reset after cutting power; and will provide a temporary fault clearing before re-energizing the circuit, it is important to note that the circuit does not restart after resetting, and close examination is required. To perform basic checks, the circuit breaker can be tilted slightly out of its socket to measure with a voltmeter to verify that there is battery voltage at both terminals, where no voltage is present, that the circuit breaker must be replaced, and that the circuit breaker may need to be reset by hand.