P0325 on a Honda: 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 Honda

On a Honda, P0325 means the knock sensor on bank 1 is not sending a proper signal to the engine computer. Without a working knock sensor, the computer can't pull ignition timing when the engine pings, which can lead to damage over time.

Is P0325 common on Hondas?

P0325 shows up on older Hondas, especially Accord, Civic, and CR-V models. The knock sensor bolts to the engine block under the intake manifold, and age-related sensor failure or a damaged wiring harness in that area is the typical cause.

Commonly reported on: Accord, Civic, CR-V, Pilot.

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	$150–450
Repair the damaged wiring harness	Mechanic	$100–300
Clean and reseat the sensor connector	Yes	$20–60

Frequently asked questions

Can I drive a Honda 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 Honda?

A knock sensor that has failed with age, common on Accord, Civic, and CR-V models. The sensor sits under the intake manifold and can also suffer wiring damage.

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

Replacing the knock sensor typically runs $150–450 with parts and labor because the intake manifold often has to come off. Wiring repairs are usually $100–300.