P0325 on a Nissan Altima
P0325 means knock Sensor 1 Circuit Malfunction (Bank 1). On the Altima, a few causes come up far more than others.
What P0325 usually means on a Altima
P0325 means the Altima's knock sensor circuit has failed, so the ECU cannot detect detonation and retards timing defensively. Expect slightly reduced power or economy while it is set. On these engines the sensor sits in the engine valley or under the intake on the V6, so access can add labor. The sensor, connector, or wiring is the usual fault.
Most common causes on the Altima
- Failed knock sensor
The sensor fails with age and heat, opening the circuit.
- Wiring or connector damage
The knock-sensor harness corrodes or chafes over time.
- Poor ground or ECU connection
A degraded ground mimics a bad sensor.
What P0325 costs to fix on a Altima
The part is modest, but on the V6 the knock sensor lives under the intake, so labor can dominate. On the four the access is friendlier. Inspect the connector and wiring first before ordering a sensor.
Year, engine and mileage change the answer. Start a case and Redline weighs these causes against what your car shows, then names the check that would settle it.
Other codes on the Nissan Altima
Related symptoms
Nissan Altima problems & recalls by year
Based on widely reported patterns for this model; individual causes vary by year, engine and history. Generic P0325 behavior is covered on the main P0325 page. Confirm with a scan tool before buying parts.
P0325 on your Altima?
Every problem becomes a Case. Tell Redline what your Altima is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.