P0325 Nissan Sentra
Knock Sensor 1 Circuit Malfunction (Bank 1) · Powertrain Code · Medium
What is P0325?
The knock sensor 1 on bank 1 is not functioning properly. The ECM cannot detect engine knock/detonation.
When the Nissan Sentra triggers code P0325 (knock sensor 1 circuit malfunction (bank 1)), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Nissan Sentra.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Nissan Sentra.
Common Causes on Nissan Sentra
- Failed knock sensor (common on QR25DE and VQ35DE)
- Knock sensor wiring harness damage
- Engine knock from carbon deposits or low-octane fuel
- Knock sensor mounting bolt not torqued to spec
Symptoms
- Check Engine Light on
- Reduced engine power (ECM retards timing)
- Slightly worse fuel economy
- Engine feels sluggish
Notes for Nissan Sentra
The knock sensor on QR25DE is buried under the intake manifold; proper torque on installation is critical for accurate readings.