How to disconnect and replace the knock sensor on Audi A4?

Unhook the cable on the negative battery terminal. In the case of four-cylinder models, the procedure is applied to either of the knock sensors. Take out the intake manifold with 1.8L and 2.0L models having different procedures. Removal Unscrew the electrical connector on the knock sensor, remove the sensor, unscrew the fastener that attaches the sensor, and disconnect the electrical connector of the knock sensor. Removal is the opposite of installation, which involves the tightening of the knock sensor fastener to the recommended torque because tightening it too tight or too loose might alter sensor efficiency. In V6 models, accessory intake manifolds would be removed on 3.0L and upper intake manifolds would be removed on 3.2L models. Find the knock sensors, and trace electrical lead of the knock sensor back to electrical connector and unscrew it. Take off the sensor assembly screw and the sensor itself. The sensor mounting fastener must be tightened to the set torque when fitting a knock sensor because tightening it more or less may have an impact on performance. Removal otherwise is the opposite of installation.

Genuine Audi A4 Knock Sensor

Engine Knock Sensor

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8 Knock Sensors found

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Audi A4 Knock Sensor Part Number: 06C-905-377
$98.76 MSRP: $138.32
You Save: $39.56 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2000-2006 Audi A4 | Base, Cabriolet | 4 Cyl 1.8 L GAS, 6 Cyl 3.0 L GAS
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Audi A4 Knock Sensor Part Number: 06K-905-377-E
$101.14 MSRP: $141.65
You Save: $40.51 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor; Knock Sensor
- Replaces: 06K-905-376, 06K-905-377
- 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 Knock Sensor Part Number: 06E-905-377-J
$102.33 MSRP: $143.32
You Save: $40.99 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor; Knock Sensor
- Replaces: 06E-905-377-A, 06E-905-376-A
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006-2016 Audi A4 | Base, Cabriolet, Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
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Audi A4 Knock Sensor Part Number: 06E-905-377-K
$102.33 MSRP: $143.32
You Save: $40.99 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor; Knock Sensor
- Replaces: 06E-905-377-C, 06E-905-377-B, 06E-905-376-B
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2016, 2006-2008 Audi A4 | Base, Premium, Premium Plus | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS
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Audi A4 Knock Sensor Part Number: 07D-905-377
$102.33 MSRP: $143.32
You Save: $40.99 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2002-2006 Audi A4 | Base, Cabriolet | 4 Cyl 1.8 L GAS
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Audi A4 Knock Sensor Part Number: 054-905-377-G
$102.33 MSRP: $143.32
You Save: $40.99 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor
- Replaces: 054-905-377
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1996-2001 Audi A4 | Avant, Base | 4 Cyl 1.8 L GAS, 6 Cyl 2.8 L GAS
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Audi A4 Knock Sensor Part Number: 030-905-377-D
$121.37 MSRP: $169.98
You Save: $48.61 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor; Knock Sensor
- Replaces: 030-905-377-C
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2005-2009 Audi A4 | Base, Cabriolet | 4 Cyl 2.0 L GAS
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Audi A4 Knock Sensor Part Number: 054-905-377-A
$121.25 MSRP: $169.81
You Save: $48.56 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 1997-2001 Audi A4 | Base | 4 Cyl 1.8 L GAS

Audi A4 Knock Sensor

The Audi A4 Knock Sensor is an Audi engine sensor that monitors the pinging sound harmful to the engine and transmits that signal to the powertrain control unit, which fine-tunes the spark timing before damage ensues. Mounted on the block, this Knock Sensor is a piezoelectric crystal that converts the sound of pinging detonation to a voltage that is in turn read by the powertrain control unit; the signal is applied to fine-tune the timing of spark and cut off early before it becomes a problem. Early 2000s and original 1990s Audis applied a single feedback channel, which affected ignition to the entire bank, but more recent editions of the Audi do use more than one feedback channel and can instead vary boost along with timing, in addition to responding to each engine the same way. The result of this development is a sharper throttle reaction, increased fuel economy and extended engine life, yet without any additional weight or complex moving components. Irrespective of the generation, the Knock Sensor is an unspoken watchdog that protects pistons, rods and Audi catalytic converters and enables the most current Audi A4 to squeeze even harder without fear of knock; a failed Knock Sensor will generally release a check engine light and a visible loss of acceleration as the PCM retimes timing within a safe range.

Choose original equipment manufacturer Knock Sensor 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 Knock Sensor 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 Knock Sensor Parts and Q&A

Knock Sensor
030-905-377-D
Q: How to disconnect and replace the knock sensor on Audi A4?
A:
Unhook the cable on the negative battery terminal. In the case of four-cylinder models, the procedure is applied to either of the knock sensors. Take out the Intake Manifold with 1.8L and 2.0L models having different procedures. Removal Unscrew the electrical connector on the knock sensor, remove the sensor, unscrew the fastener that attaches the sensor, and disconnect the electrical connector of the knock sensor. Removal is the opposite of installation, which involves the tightening of the knock sensor fastener to the recommended torque because tightening it too tight or too loose might alter sensor efficiency. In V6 models, accessory intake manifolds would be removed on 3.0L and upper intake manifolds would be removed on 3.2L models. Find the knock sensors, and trace electrical lead of the knock sensor back to electrical connector and unscrew it. Take off the sensor assembly screw and the sensor itself. The sensor mounting fastener must be tightened to the set torque when fitting a knock sensor because tightening it more or less may have an impact on performance. Removal otherwise is the opposite of installation.