P0325 on a Toyota: 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 Toyota

On a Toyota, 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 pull ignition timing; without it, the engine can't protect itself from pinging.

Is P0325 common on Toyotas?

P0325 is common on older Toyotas, especially Camry, Corolla, and RAV4 models with the 2AZ-FE four-cylinder engine. The knock sensor sits under the intake manifold, and sensor failure or chafed wiring in that area is the usual cause.

Commonly reported on: Camry, Corolla, RAV4, Tacoma.

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	Yes	$150–400
Repair the chafed wiring harness	Mechanic	$100–300
Clean and reseat the sensor connector	Yes	$20–60

Frequently asked questions

Can I drive a Toyota 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 Toyota?

A failed knock sensor, which is common on Camry, Corolla, and RAV4 models with the 2AZ-FE engine. Chafed wiring under the intake manifold is also a frequent cause.

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

Replacing the knock sensor typically runs $150–400 with parts and labor. A wiring repair is usually $100–300, and cleaning the connector is a cheap fix.