P0325: Knock Sensor 1 Circuit Malfunction Bank 1 or 1 Sensor
- Knock sensor circuit short to ground
- Knock sensor circuit short to power
- Knock sensor circuit open
- Faulty knock sensor
- Faulty Engine Control Module (ECM)
Replacing the knock sensor usually takes care of the problem.
The knock sensor
is attached to the cylinder block. It senses engine knocking using a
piezoelectric element. A knocking vibration from the cylinder block is
sensed as vibrational pressure. This pressure is converted into a
voltage signal and sent to the Engine Control Module (ECM).
I have a bmw 328is 97 nsounds good idealing,once rpm s get up btween 2/3 looses power n makes a weird noise any help/
Knock Sensor Circuit Malfunction
What does that mean?
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.
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Symptoms
You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms.
Causes
A code P0325 most likely means one or more of the following has happened:
P0325 OBD-II Trouble Code
Technical Description: Knock Sensor Circuit Malfunction
What does that mean?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.
Hope this helps.
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