P0325 on a Lexus: 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 Lexus

On a Lexus, 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 ignition timing; a bad sensor circuit leaves the engine without that protection.

Is P0325 common on Lexuss?

P0325 shows up on Lexus models with higher mileage, especially RX, ES, IS, and GX nameplates. The knock sensor sits under the intake manifold on many Lexus engines, and sensor failure or chafed wiring in that area is the usual cause.

Commonly reported on: RX, ES, IS, GX.

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	$200–500
Repair the wiring harness near the sensor	Mechanic	$100–350
Clean and reseat the sensor connector	Yes	$20–60

Frequently asked questions

Can I drive a Lexus 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 Lexus?

A failed knock sensor, common on higher-mileage RX, ES, IS, and GX models. The sensor sits under the intake manifold and can also suffer chafed wiring.

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

Replacing the knock sensor typically runs $200–500 with parts and labor. A wiring repair is usually $100–350, and cleaning the connector is a cheap fix.