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2000 Nissan Quest P0325 Knock Sensor Fault Code: Causes and Diagnostics

Model: 2000 Nissan Quest Fault Code: P0325 Posted: 2008-03-29 22:02

Symptoms: After the engine warms up, the vehicle stalls when stopped and experiences misfires while driving. The issue does not occur when the car is cold. I recently had an auto parts store perform a basic diagnostic check and found a P0325 knock sensor fault code. This has raised concerns—since replacing the knock sensor can cost around $1000—is it possible that this is actually not the root cause? I've already checked for vacuum leaks and confirmed that the EGR system appears to be functioning properly. The check engine light has been off most of the time, though my wife recalled it briefly illuminating one day. I’ve read online that a faulty knock sensor may not produce symptoms like stalling or misfiring, which makes me suspect an alternative cause. Before replacing the sensor, I’d like to know what other components could be responsible for these symptoms and why no fault code is consistently displayed. Can a bad oxygen sensor, throttle position sensor (TPS), or mass airflow sensor (MAF) lead to this behavior? If so, would they generate a diagnostic trouble code (DTC)? I plan to inspect the wiring and perform an ohm test on the knock sensor—what are the correct resistance values for a 2000 Nissan Quest knock sensor? Any guidance on what else to investigate before assuming it's a sensor failure would be greatly appreciated.

Related fault codes
P0325
Comments (3)
Anonymous 2008-03-30 11:03

P0325 knock sensor DTCs are common in 2000 Nissan Quest models, but the issue is often not with the sensor itself. If you're considering replacement, it's best to obtain an original Nissan part from the dealer rather than a generic aftermarket one.

Anonymous 2008-03-30 16:00

Thanks for the advice—I’ll prioritize getting a genuine Nissan OEM knock sensor if needed. I’m skeptical that a faulty knock sensor is responsible, given how severe the symptoms are (stalling at stops and misfiring while driving), which don’t typically align with what a bad knock sensor would cause. It’s confusing why such significant performance issues aren’t triggering a persistent check engine light or other fault codes. Could components like a failing oxygen sensor, throttle position sensor (TPS), or mass airflow sensor (MAF) be responsible? If so, wouldn't these also generate a diagnostic code?

Anonymous 2008-03-31 05:03

No—those sensors won’t cause the symptoms you're describing. Try replacing the knock sensor as a test or consult a professional for a full diagnosis. Misfires, incorrect ignition timing, or engine mechanical issues are more likely root causes of both P0325 and your observed symptoms.