Buy OEM Subaru Part # 22060AA031 (22060AA030). Ignition Knock ((Detonation)) Sensor. Knock Sensor A failed Knock Sensor will often have no noticeable symptoms beyond a check engine

SENSOR ASSEMBLY-KNOCK Ignition Knock (Detonation) Sensor

Fits Impreza, Legacy, Outback, SVX

Knock Sensor
A failed Knock Sensor will often have no noticeable symptoms beyond a check engine light or engine ping or knock, but it does cause your Subaru to operate inefficiently and produce higher emissions. Our technicians have access to manufacturer-approved repair processes and Subaru genuine parts.