An illuminated check engine light on a customer’s 1998 Honda Accord EX, that is registering a trouble code P0325, could be caused by the knock sensor, the connection, wire harness or the Engine Control Module (ECM). Replace the knock sensor and the trouble code resets.

Tests:
1. With the knock sensor unplugged and using a digital volt ohmmeter (DVOM), check for 0.02V to 0.03V reference voltage from the ECM to the knock sensor.

Courtesy of Identifix.

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