Where are the knock sensor(s) located, and what steps are needed to access and replace them on Audi A3?

Knock sensors(s) are mounted on the inlet manifold side of the cylinder block, part situated on some models have two sensors. In order to reach the sensor, one has to remove the engine top cover(s). In case of inadequate access, press hard on the handbrake, lift the front part of the vehicle and hold it on axle stands. Then, unscrew the retaining screws and remove the engine undertray(s) to have access underneath. Even though the access to the knock sensor(s) is rather cumbersome, one can make it better by taking out the inlet manifold. Unhook the wiring connector either to sensor or trace the wiring and disconnect its connector. Unscrew the mounting bolt and take out the sensor out of the cylinder block. To refit, reverse of the process of removal makes the sensor and cylinder block mating surfaces clean and dry and attach the mounting bolt to the required torque to ensure correct operation.

Genuine Audi A3 Knock Sensor

Engine Knock Sensor

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3 Knock Sensors found

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Audi A3 Knock Sensor Part Number: 06K-905-377-E
$101.14 MSRP: $141.65
You Save: $40.51 (29%)
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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:
- 2022-2024, 2015-2020 Audi A3 | Premium, Premium Plus, Prestige, TDI Premium, TDI Premium Plus, TDI Prestige, Titanium | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
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Audi A3 Knock Sensor Part Number: 06E-905-377-J
$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-A, 06E-905-376-A
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006-2013 Audi A3 | Base, TDI | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
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Audi A3 Knock Sensor Part Number: 06F-905-377
$99.95 MSRP: $139.98
You Save: $40.03 (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:
- 2006-2008 Audi A3 | Base | 4 Cyl 2.0 L GAS

Audi A3 Knock Sensor

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Audi A3 Knock Sensor Parts and Q&A

Knock Sensor
06E-905-377-J
Q: Where are the knock sensor(s) located, and what steps are needed to access and replace them on Audi A3?
A:
Knock sensors(s) are mounted on the inlet manifold side of the cylinder block, part situated on some models have two sensors. In order to reach the sensor, one has to remove the engine top cover(s). In case of inadequate access, press hard on the handbrake, lift the front part of the vehicle and hold it on axle stands. Then, unscrew the retaining screws and remove the engine undertray(s) to have access underneath. Even though the access to the knock sensor(s) is rather cumbersome, one can make it better by taking out the inlet manifold. Unhook the wiring connector either to sensor or trace the wiring and disconnect its connector. Unscrew the mounting bolt and take out the sensor out of the cylinder block. To refit, reverse of the process of removal makes the sensor and cylinder block mating surfaces clean and dry and attach the mounting bolt to the required torque to ensure correct operation.