Help your engine's computer hear detonation with the Standard Ignition Ignition Knock (Detonation) Sensor KS178. A knock sensor picks up the high-frequency vibrations of engine knock and sends a voltage signal to the ECU so it can adjust ignition timing accordingly. This bolt-on sensor drops in as a direct-fit replacement for the 1994-1995 BMW 530I (V8-3.0L), 1994-1995 BMW 540I (V8-4.0L), 1993-1995 BMW 740I and 740IL (V8-4.0L), the 1996 BMW 740IL (V8-4.4L), and the 1994-1995 BMW 840CI (V8-4.0L).
- 100% tested: every unit passes an accelerometer vibration test to help ensure trouble-free operation.
- Broad frequency response: designed to respond to knock frequencies up to 1000 Hz, accommodating shifts in engine knock frequency across a broad range of vehicle conditions.
- Monitored output: an automated data acquisition system continuously checks that the sensor delivers the appropriate voltage output at the specified frequency range.
- Emission-component quality: quality control is maintained through the manufacturing process, from componentry to finished product.
Mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused. The number of knock sensors used varies by application; some listed BMW models use four, so order the quantity your engine requires. Country of origin: Germany.
Interchange: Manufacturer part number KS178.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does the KS178 knock sensor do?
It detects the vibrations of engine knock (detonation) and sends a voltage signal to the engine computer, which can then adjust ignition timing to manage the knock.
Which vehicles does this sensor fit?
It's a direct-fit replacement for the 1994-1995 BMW 530I, 540I and 840CI, the 1993-1995 BMW 740I and 740IL, and the 1996 BMW 740IL. See the Buyer's Guide tab for engine codes.
Is mounting hardware included?
No. Mounting hardware is not included; consult the vehicle service information for the correct fasteners and whether they may be reused.
How many knock sensors do I need?
It varies by application — some listed BMW models use four sensors while others use one. The package minimum order quantity is 1, so order the number your engine requires.
What are signs a knock sensor may need replacing?
A knock-sensor trouble code, an illuminated check engine light, or audible pinging can be signs. Diagnose the underlying cause first, since these symptoms can have other sources.
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