Parts for your 2011 Subaru Forester-Crank angle sensor

2011 Subaru Forester crank angle sensor

Based on the Subaru Factory Service Manual for the 2011MY Forester, Subaru Technical Information System (STIS) wiring diagrams, and OEM parts catalogues used by dealers, the 2011 Subaru Forester is fitted with a crankshaft position sensor, commonly referred to as a crank angle sensor (CAS). Both the non‑turbo 2.5 (FB25) and the turbo 2.5 (EJ255, XT) engines list and test this sensor in factory procedures, confirming it’s relevant and used on this model.

The crank angle sensor on a 2011 Forester tells the engine computer exactly where the crankshaft is and how fast it’s spinning. That live timing info is what the ECU uses to fire the coils, trigger the injectors, and keep the whole show running smoothly. If the CAS signal goes missing or messy, you’ll see hard starting, random stalling under the bonnet, or a no‑start with the tacho dropping to zero. It’ll usually log a fault like P0335 to P0339.

There’s no scheduled replacement for the crank angle sensor, it’s a fit‑and‑forget part unless it fails. During regular servicing, it’s smart to eyeball the harness and connector for heat or oil soak, especially around the front of the engine on FB25s and near the top of the block on EJ255s. Keep the connector clean and avoid blasting the area with high‑pressure water. If replacing, use a quality OEM‑spec sensor, lightly oil the O‑ring, and torque the retaining bolt correctly. Always disconnect the battery first, and keep the magnetic tip away from swarf or filings.

• Common symptoms: long crank/no start, sudden stall, rough running, flickering or dead tacho, stored DTCs (P0335–P0339).
• Quick checks: scan live data for RPM during cranking, wiggle‑test the loom under the intake/at the front cover, and confirm good battery voltage.
• After replacement: clear codes, start and let it idle for a minute, then take a short drive so the ECU can settle trims. If a cam sensor code appears with the crank code, check timing (belt on EJ255, chain on FB25) before throwing more parts at it.

DIY‑friendly? Generally yes — access is from above with basic hand tools. Labour time is modest, often under an hour. If the vehicle has racked up big kilometres or has had oil leaks near the connector, organising a pre‑emptive inspection during a routine service can save a roadside headache later.

Popular questions

Where is the crank angle sensor on a 2011 Subaru Forester?
It’s mounted to the engine block aiming at a toothed wheel on the crank. On FB25 models it’s located at the front of the engine near the crank pulley area, on EJ255 (XT) it’s positioned on the block where it can read the crank trigger wheel. Access is typically from the top once intake ducting is out of the way.

What fault codes point to a bad crank angle sensor?
Common crank‑sensor codes are P0335, P0336 and related variants up to P0339. You may also see random misfire codes if the signal drops out. Always check wiring and connectors before condemning the sensor.

Should it be replaced as routine maintenance?
No. There’s no scheduled interval. Replace only if faulty or damaged. During servicing, a quick visual check of the wiring and connector, plus scanning for stored or pending DTCs, is all that’s needed.