P0325 fault code: what it means

P0325: Knock sensor 1 (bank 1 or single sensor) circuit fault. Engine may retard timing and lose a little power.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

failed knock sensor
corroded or damaged sensor connector
damaged knock sensor wiring

P0325 by make

Honda

Knock sensor circuit fault. Common on K24 (sensor at back of block) and J35 V6 (sensor under the intake manifold, so labour is high).

Usual causes: failed knock sensor (use genuine part); rodent-chewed or broken knock sensor sub-harness; connector corrosion

Kia

Knock sensor 1 circuit fault. On Theta II engines can be tied to bearing wear; on 2.5 Theta (K5) a software update is out.

Usual causes: damaged knock sensor wiring or connector; faulty knock sensor; engine bearing wear (Theta II); ECU knock calibration needing update

Not sure what P0325 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.