P0325 on a Nissan: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

You can drive, but the engine runs with reduced timing protection and fuel economy may drop, so have the knock sensor checked soon.

What P0325 means on a Nissan

On a Nissan, P0325 means the knock sensor on bank 1 is not sending a proper signal to the engine computer. The sensor detects engine knock so the computer can adjust timing; a failed sensor leaves the engine running without that protection.

Is P0325 common on Nissans?

P0325 is a common code on Nissan V6 engines, especially Altima, Maxima, Pathfinder, and Frontier models. On the VQ engines the knock sensor sits under the intake plenum and is known to fail with age, which makes replacement labor-intensive.

Commonly reported on: Altima, Sentra, Rogue, Frontier.

Symptoms

Check engine light on
Reduced fuel economy
Engine pinging under load
Slight loss of power

Common causes

most common: Failed knock sensor
common: Chafed or damaged sensor wiring harness
common: Corroded or loose sensor connector
rare: Engine computer issue

How to fix it

Fix	DIY?	Typical cost
Replace the knock sensor	Mechanic	$250–600
Repair the wiring harness near the sensor	Mechanic	$100–300
Clean and reseat the sensor connector	Yes	$20–60

Frequently asked questions

Can I drive a Nissan with a P0325 code?

Yes, in most cases. The engine still runs, but without knock protection it may ping under load, and fuel economy can drop, so get it checked soon.

What usually causes P0325 on a Nissan?

A knock sensor that has failed with age, which is common on Nissan V6 engines. On the VQ engines the sensor sits deep under the intake plenum.

How much does it cost to fix P0325 on a Nissan?

Replacing the knock sensor typically runs $250–600 with parts and labor because the intake plenum has to come off. Wiring repairs are usually $100–300.