Parts for your 2011 Subaru Forester-Camshaft sensor

2011 Subaru Forester Camshaft Sensor

Based on factory documentation and parts catalogues, the 2011 Subaru Forester is fitted with camshaft position sensor(s). The Subaru Factory Service Manual for the 2011 Forester (STIS) includes diagnostics for DTCs such as P0340/P0341/P0345 relating to the camshaft position sensor circuit, and Subaru’s parts listings (FAST) show camshaft position sensors for both the FB25 (2.5L chain-driven, naturally aspirated) and the EJ255 (2.5L turbo) engines. Independent service databases (e.g., ALLDATA/Mitchell) also publish test and replacement procedures for these sensors on 2011 Forester models.

On a 2011 Forester, the camshaft sensor works hand-in-glove with the crank sensor to let the ECU know exactly where each cam is in its rotation. That timing info is vital for accurate fuel injection, spark, and for controlling Subaru’s variable valve timing (AVCS). When the sensor’s signal goes flaky, drivers can see hard starts, rough idle, flat spots on acceleration, poor fuel economy, or a check engine light.

The sensor itself is solid-state and not a consumable item, so there’s no scheduled replacement interval. As part of regular servicing, it’s smart to keep engine oil fresh and the correct grade, because clean oil helps the AVCS system respond crisply—dirty oil can cause timing behaviour that mimics a failing sensor. A quick look under the bonnet for damaged wiring or oil seeping into the sensor connector is time well spent, especially around the rear of the cylinder heads where the sensors live on FB25 engines.

Replacement is straightforward for most home tinkerers: disconnect the battery, unplug the sensor, remove the retaining bolt, and swap in a quality OEM or equivalent unit with a fresh O-ring. Refit the bolt and tighten to the specification in the Subaru service manual, reconnect the plug, clear any codes, and take it for a proper road test. No special relearn is usually required, but checking live data for a clean, stable cam signal is good practice.

If a cam code returns after swapping the sensor, don’t overlook basics: wiring integrity, connector pin fit, correct oil level/condition, and mechanical timing health (belt on EJ255, chain on FB25). A quick diagnostic scan and a visual once-over can save a lot of guesswork.

• Use quality oil and filters to support AVCS operation.
• Inspect sensor connectors for oil intrusion or brittle wiring.
• Confirm ECU codes and live data before and after replacement.

Popular questions about the 2011 Subaru Forester camshaft sensor

Where is the camshaft sensor located on a 2011 Forester?
It depends on the engine. On the FB25 (most non-turbo 2011 models), there are two sensors mounted at the rear of the cylinder heads. On the EJ255 turbo, the cam sensor(s) are on the cam carriers near the timing end. Access is from the top under the bonnet, removing a cover or intake ducting can make life easier.

Can a dirty or oily camshaft sensor be cleaned, or should it be replaced?
If the connector is oily or dirty, cleaning the plug and reseating it can help. If the sensor itself is failing electrically or a code returns promptly after cleaning, replacement is the fix. Always check wiring and oil condition before condemning the sensor.

How long does replacement take?
With the right tools, most techs allow about half an hour to an hour per sensor. Time varies with engine, access, and whether any intake ducting needs to be moved out of the way. After fitting, clear the codes and confirm stable cam/crank sync on a road test.