Parts for your 2011 Subaru Exiga-Knock sensor

2011 Subaru Exiga Knock Sensor: what it does, where it is, and when to replace it

Based on technical sources, the 2011 Subaru Exiga is fitted with a knock sensor and relies on it for proper engine management. Subaru’s FAST electronic parts catalogue lists a knock sensor for the YA-series Exiga with EJ20 engines (common part numbers include 22060-AA061/22060-AA140), and the factory Service Manual includes inspection procedures and diagnostic trouble codes P0327/P0328 for the sensor circuit. That makes the knock sensor both relevant and essential on this model.

On the Exiga’s EJ engine, the knock sensor “listens” for abnormal combustion (pinging/detonation) by detecting specific vibration frequencies in the block. When knock is detected, the ECU trims ignition timing to protect the pistons and bearings, helping the car run smoothly on everyday Aussie and Kiwi fuels, keeping performance tidy and emissions in check.

It’s not a regular service item, but as these cars age, the sensor and its wiring can become a quiet troublemaker. Typical hints it’s on the way out include a check-engine light with codes P0327/P0328, sluggish acceleration, increased fuel use, or audible pinging under load. Because the ECU may pull timing to play it safe, the Exiga can feel a bit flat when the sensor or its wiring isn’t happy.

For servicing, a quick visual is worthwhile: make sure the harness isn’t brittle or oil-soaked and that the connector is clean and snug. If replacement is needed, the sensor sits on top of the engine block beneath the intake manifold area. The job generally involves disconnecting the battery, removing the top-mount intercooler on GT models (or intake ducting on non-turbo), unplugging the sensor, removing the single bolt, then installing a quality OE-equivalent unit. Clean the mating surface, avoid grease on the contact face, and torque the bolt accurately (around 24 N·m is typical for EJ engines). Correct orientation and routing per the Subaru manual matter for signal accuracy and durability. Clear the codes and do a proper road test.

There’s no fixed replacement interval, it’s condition-based. Sticking with the recommended octane for the specific Exiga variant, maintaining good engine earths, and keeping oil leaks at bay will all help the knock sensor do its job for many kilometres.

• Common signs: CEL with P0327/P0328, dull performance, poor economy, pinging
• Best practice: inspect wiring at each major service, replace sensor if cracked or throwing codes
• After replacement: no coding required, clear faults and let the ECU relearn with a normal drive

Popular questions

Where is the knock sensor on a 2011 Subaru Exiga?
On EJ-powered Exiga models, it’s mounted on the top of the engine block under the intake manifold area, roughly central and towards the bellhousing side. Access typically requires removing the top-mount intercooler on turbo variants or lifting intake ducting on non-turbo cars.

Is it safe to drive with a faulty knock sensor?
The car will usually run, but the ECU may pull ignition timing to avoid risk, making it feel sluggish and thirsty. More importantly, a faulty sensor can fail to detect real knock, which isn’t ideal for engine longevity. Best to diagnose and repair promptly rather than keep driving around it.

Does a new knock sensor need programming?
No special coding is required. Fit the sensor, torque it correctly, route the loom as per the manual, clear any codes, and road test. The ECU will adapt on its own, at most, a basic idle relearn after battery disconnect may be noticed.