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P0327 - Knock Sensor 1 Circuit Low Input


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I checked this code on my parent's 2000 Legacy wagon with the access port I have for my '06. I cleared it and it didn't come back on a 10 mile drive where I tried tacing it up a couple times. Does low input mean it just can't read the sensor well and that it may need to be replaced or is it a real problem?
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