How to access and replace the knock sensors on BMW 325i?

Disconnect the negative battery cable. To access the knock sensors, remove the intake manifold. There are two knock sensors on the left side of the block. The front knock sensor is located on the block near the ECT sensor. The rear knock sensor is mounted behind the starter motor. Mark the mounting angle of the sensors. Disconnect the electrical connector to the sensors. Remove the mounting bolt at each sensor. These bolts are aluminum and must be discarded. Installation is the reverse of removal, noting the following points: Clean the block surface before installing the sensors. Use new aluminum bolts. Mount the sensors at the same angle as original. Tighten bolts to 63 in-lbs, then an additional 90-degrees.

Genuine BMW 325i Knock Sensor

Engine Knock Sensor

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BMW 325i Engine Knock Ping Sensor
Part Number: 13627566785
$118.21 MSRP: $173.02
You Save: $54.81 (32%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Ping Sensor; Knock Sensor
- Replaces: 13-62-7-525-039
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2006 BMW 325i | Sedan(E90)
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BMW 325i Ignition Knock Detonation Sensor Compatible
Part Number: 12141738667
$177.90 MSRP: $235.97
You Save: $58.07 (25%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Ping Sensor; Knock Sensor
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1992-1995 BMW 325i | Convertible(E36), Sedan(E36)
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BMW 325i Knock Sensor
Part Number: 13627568422
$118.21 MSRP: $173.02
You Save: $54.81 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Ping Sensor
- Replaces: 12-14-1-435-485
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2001-2005 BMW 325i | Sedan M54 Engine(E46), Sedan M56 Engine(E46), Sedan(E46), Wagon M54 Engine(E46), Wagon M56 Engine(E46), Wagon(E46)
View related parts
BMW 325i Knock Sensor
Part Number: 12141435485
$118.21 MSRP: $173.02
You Save: $54.81 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Ping Sensor
- Replaced by: 13627568422
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2001-2005 BMW 325i | Sedan M54 Engine(E46), Sedan M56 Engine(E46), Sedan(E46), Wagon M54 Engine(E46), Wagon M56 Engine(E46), Wagon(E46)

BMW 325i Knock Sensor

The BMW 325i Knock Sensor is a sensitive microphone built into the engine that detects destructive spark knock before it can damage the pistons and rob the engine of power. The Knock Sensor is firmly mounted on the block and employs a piezoelectric crystal to convert vibration pulses into voltage. The data is sent to the BMW powertrain control module, which immediately trims ignition advance until the pinging stops. It then restores timing to achieve maximum thrust and economy. The earlier 325i versions relied on a single broad-band Knock Sensor mounted on the engine block to cover all cylinders. Later 325i engines use dual units that sample bank-specific frequencies, enabling cylinder-select timing corrections. 325i engines will be able to maintain tighter control operation right near the knock limit. Should the defective Knock Sensor fail to be detected, the PCM will not switch to low octane or high heat and, subsequently, your 325i will lose efficiency and begin to trigger a warning light. No matter the generation, this feedback loop allows a BMW to provide smooth acceleration, low emissions, and extended service life with a range of fuels. Replacement Knock Sensor units must have the correct factory frequency and connector type to keep any BMW running at peak performance.

If you are looking for OEM BMW 325i Knock Sensor, we highly recommend to shop with us. Not only do we offer budget friendly prices, but we also provide fast delivery. In addition, we have a hassle-free return policy on all genuine BMW 325i Knock Sensor that come backed by the manufacturer's warranty.

BMW 325i Knock Sensor Parts Questions & Experts Answers

Engine Knock Ping Sensor
13627566785
Q:
How to access and replace the knock sensors on BMW 325i?
Posted by Brendan N.
A:
Disconnect the negative battery cable. To access the knock sensors, remove the intake manifold. There are two knock sensors on the left side of the block. The front knock sensor is located on the block near the ECT sensor. The rear knock sensor is mounted behind the starter motor. Mark the mounting angle of the sensors. Disconnect the electrical connector to the sensors. Remove the mounting bolt at each sensor. These bolts are aluminum and must be discarded. Installation is the reverse of removal, noting the following points: Clean the block surface before installing the sensors. Use new aluminum bolts. Mount the sensors at the same angle as original. Tighten bolts to 63 in-lbs, then an additional 90-degrees.
Answered by BMW Parts Specialist Koleman / Mar 23, 2024