DTC P0325 - Knock Sensor Circuit Malfunction
A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged. The computer uses this information to tune the engine so that it doesn't knock. If your knock sensor wasn't operating properly, so that it was always indicating a knock, the engine computer's response may have been to change the ignition timing on your engine. Knock sensors generally bolt into or thread into the engine block. This P0325 code may show up intermittently or the Service Engine light may be lit constantly. Other knock sensor related DTC codes include P0330.
This diagnostic DTC is used to check the PCM and its Knock Sensor (KS) module. The PCM has stored a calibrated time that it considers to be a valid spark knock duration. If the PCM sees a knock event that was longer in duration than the acceptable time, the PCM sets DTC P0325.
CONDITIONS FOR SETTING THE DTC
- Test continuously.
- Ignition voltage 11 volts or more.
Failure Condition: The knock sensor reports a knock event longer than 99.99 milliseconds for 3 seconds continuously.
ACTION TAKEN WHEN THE DTC SETS
- Ignition control uses the 87 octane spark advance.
- The PCM will illuminate the Malfunction Indicator Lamp (MIL) after two consecutive drive trips that the diagnostic runs and fails.
- The PCM will record operating conditions at the time the DTC sets. This information will be stored in the Freeze Frame and Failure Records.
- A first failure of this DTC will store in Last Test Failed but not History.
CONDITIONS FOR CLEARING THE MIL/DTC
- The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.
- A Last Test Failed DTC will clear when the diagnostic runs and does not fail.
- A History DTC will clear after forty consecutive warm-up cycles with no failures of any diagnostic test.
- PCM battery voltage is interrupted.
- Using a Scan tool.
You are positive you are not hearing any spark knock, ping, engine noise etc... if not than yes, the sensor is the most common by % of times. Check THIS LINK
Remove the intake manifold. Refer to Engine / Intake Manifold / Service and Repair.
Disconnect the knock sensor electrical connector.
Remove the knock sensor.
Install the knock sensor. Tighten the knock sensor to 19 Nm (14 lb ft).
Connect the knock sensor electrical connector.
Reinstall the intake manifold.
hope this helps.