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Old 13 Apr 2012, 10:01 am
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Default Where is the knock sensor on my 2001 Honda Civic Lx?

I bought a replacement sensor, but I can't find where it goes.
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Old 13 Apr 2012, 10:20 am
ma ma is offline
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The knock sensor responds to spark knock caused by Pre-detonation of the Air/Fuel mixture. As the flame front moves out from the spark plug ignition point, pressure waves in the chamber crash into the piston or cylinder walls resulting in a sound known as a knock or ping. This is caused by using a fuel with a low octane rating, overheating, or over advanced timing. Sometimes it can be caused by hot carbon deposits on the piston or cylinder head that raise compression. A knock sensor is comprised of Piezoelectric materials; Crystals that when impacted, generate a voltage (same idea as a BBQ ignitor). This voltage is monitored by the computer, and when an irregularity is detected, the computer corrects timing in VVT (variable valve timing) engines, or triggers a DTC Diagnostic Trouble Code) in older vehicles.

so the knock sensor should to close to combustion chamber

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Old 13 Apr 2012, 10:32 am
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The knock sensor is located on the back side of the engine and can be seen from the bottom of the car on the driver's side. You may be able to see it if you raise the left side of the vehicle and remove the wheel.
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