What is the purpose of the Knock Sensor on BMW M3?

The Knock Sensor (KS) is a crucial component that provides information to the Engine Control Module (ECM) about detonation in the engine. If knock is detected, the ECM will retard the ignition timing to prevent internal mechanical damage. The KS sensor also allows the ECM to optimize ignition timing based on various factors. If low-grade fuel is used, the ECM will compromise engine power output for safe operation. To optimize performance, it is recommended to use a quality grade of fuel as specified in the owner's manual. Testing for KS malfunctions should be done using a BMW service tester or suitable Data Scan Tool (DST) to check for stored faults. When removing and installing the KS, it is important to torque it to specification and apply a locking agent to the threads. The KS sensors are located on the left side of the engine block. Disconnecting various components and plugs, noting their locations and routing, is necessary for removal and installation. Finally, tighten the KS to the specified torque, reconnect the water pipe and knock sensor plugs, and reinstall the wire duct and upper intake manifold.

Genuine BMW M3 Knock Sensor

Engine Knock Sensor

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6 Knock Sensors found

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BMW M3 Knock Sensor
Part Number: 13627566786
$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
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2015-2018 BMW M3 | Sedan(F80)
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BMW M3 Knock Sensor
Part Number: 12147839167
$67.98 MSRP: $87.20
You Save: $19.22 (23%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Ping Sensor
- Replaces: 12-14-7-830-788
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2001-2006 BMW M3 | Convertible(E46), Coupe(E46)
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BMW M3 Knock Sensor
Part Number: 13627636937
$44.43 MSRP: $62.90
You Save: $18.47 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Ping Sensor
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2021-2025 BMW M3 | 6 Cyl 3.0 L GAS
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BMW M3 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:
- 1995-1996 BMW M3 | Coupe(E36)
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BMW M3 Knock Sensor
Part Number: 12141703276
$182.74 MSRP: $242.39
You Save: $59.65 (25%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Ping Sensor
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 1997-1999 BMW M3 | Convertible(E36), Coupe(E36), Sedan(E36)
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BMW M3 Engine Knock / Ping / Detonation Sensor
Part Number: 12147830788
$67.98 MSRP: $87.20
You Save: $19.22 (23%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Ping Sensor
- Replaced by: 12147839167
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2001-2006 BMW M3 | Convertible(E46), Coupe(E46)

BMW M3 Knock Sensor

The BMW M3 Knock Sensor protects the engine from harmful detonation by listening for high frequency vibrations and telling the control computer to fine tune the engine's ignition timing. This piezoelectric device bolts to the block where combustion pulses are transformed into electrical signals that travel to the powertrain control module, which adjusts spark advance in minute increments until knock goes away, then works its way back to full timing. The Knock Sensor signal allows the module to respond in milliseconds. By keeping operation near the knock limit, it provides strong performance, improved fuel economy, and cleaner emissions even when there are changes in the quality of the fuel, altitude, or weather in modern BMW engines. Earlier M3 models applied a single broadband Knock Sensor to the computer while later M3s applied a paired Knock Sensor layout to monitor individual banks of cylinders for finer control. On current M3s, this twin sensor strategy enables faster corrections to be made, but in both instances, the motor is protected by the same routine of vibration to voltage monitoring. The primary dissimilarity is resolution, with dual sensors allowing timing to be specified on a per-bank basis rather than for the entire engine. Quiet operation, rapid acceleration, and long-term reliability in each and every BMW M3 owe a lot to the ever-watchful Knock Sensor.

If you are looking for OEM BMW M3 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 M3 Knock Sensor that come backed by the manufacturer's warranty.

BMW M3 Knock Sensor Parts Questions & Experts Answers

Ignition Knock Detonation Sensor Compatible
12141738667
Q: What is the purpose of the Knock Sensor on BMW M3?
A:
The Knock Sensor (KS) is a crucial component that provides information to the Engine Control Module (ECM) about detonation in the engine. If knock is detected, the ECM will retard the ignition timing to prevent internal mechanical damage. The KS sensor also allows the ECM to optimize ignition timing based on various factors. If low-grade fuel is used, the ECM will compromise engine power output for safe operation. To optimize performance, it is recommended to use a quality grade of fuel as specified in the owner's manual. Testing for KS malfunctions should be done using a BMW service tester or suitable Data Scan Tool (DST) to check for stored faults. When removing and installing the KS, it is important to torque it to specification and apply a locking agent to the threads. The KS sensors are located on the left side of the engine block. Disconnecting various components and plugs, noting their locations and routing, is necessary for removal and installation. Finally, tighten the KS to the specified torque, reconnect the water pipe and knock sensor plugs, and reinstall the wire duct and upper intake manifold.