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: 8E0-937-503
$15.31 MSRP: $24.50
You Save: $9.19 (38%)
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Product Specifications
- Other Name: Plate; Relay Fuse 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 Relay & Fuse Plate Part Number: 8K1-937-503-B
$23.99 MSRP: $38.38
You Save: $14.39 (38%)
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Product Specifications
- Other Name: Plate; Relay Fuse 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%)
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Product Specifications
- Other Name: Holder; Fuse Box, Fuse Holder
- 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 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: 4A0-941-822
$203.49 MSRP: $285.00
You Save: $81.51 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Plate; Relay Fuse 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: 8L0-941-822-A
$290.36 MSRP: $406.67
You Save: $116.31 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Plate; Relay Fuse 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
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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
ADD TO CART
Product Specifications
- Other Name: Plate; Relay Fuse 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: 8K0-971-845-A
$48.39 MSRP: $66.66
You Save: $18.27 (28%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Mounting; Relay Fuse Plate
- 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
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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, Relay Fuse 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: 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, Relay Fuse 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
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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, Relay Fuse 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
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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
ADD TO CART
Product Specifications
- Other Name: Bracket; Relay Fuse Plate
- 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

Audi A4 Fuse Box

Audi A4 Fuse Box is the power point that functions as the central protection of the vehicle and interrupts the supply of power in situations where there is a surge or a short that is endangering the sensitive electronics. It should be mounted in a small plastic device holding automotive fuses rated up to 32 volts, and some of its slots can accept 42 volt links to newer Audi parts, such as lights, audio units, power locks, and so on, with the wiring overheating the strip of metal before it melts. The majority of current Audi vehicles have a Fuse Box in the engine bay and one under the dash, whereas older models applied the single cabin unit as the primary part, resulting in vehicles with two locations, reducing the length of cable runs and placing high-draw circuits closer to the battery. When the car will be parked for weeks, an optional ignition-off-draw fuse may be removed and slow battery drain prevented. It is common to see headlamps suddenly go dim, a silent radio, or frozen door locks in cases where individual fuses are not broken but corrosion in the main Fuse Box requires replacement. While shopping, Audi owners are supposed to compare amp rating, connector shape, and mounting tab to factory standards and balance features. During installation, drivers who include LED strips or add additional speakers should ensure that their wiring can withstand the load, and a more robust Fuse Box with empty slots and resettable circuit breakers may be necessary. This is applicable to any generation of the A4 sedan and wagon, and any Audi enthusiast is guaranteed of maintaining secure safe electrics.

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.