Parts for your 2010 Subaru Forester-Camshaft sensor

2010 Subaru Forester Camshaft Sensor — What It Does and How To Look After It

Technical sources confirm the 2010 Subaru Forester does use a camshaft position sensor. The Subaru Factory Service Manual for 2010MY Forester (Engine Control sections for both H4 SOHC and H4 DOHC turbo) includes diagnostics for DTCs such as P0340/P0341/P0345 related to the camshaft position sensor, and the Subaru wiring diagrams show dedicated CMP signal circuits to the ECU. Genuine Subaru parts catalogues also list a “Sensor Assy – Camshaft Position” for 2010 Forester models — typically one sensor on the EJ253 (non‑turbo) and two sensors on the EJ255 (turbo), reflecting each engine’s valve timing setup.

The camshaft sensor on a 2010 Forester is the quiet achiever that keeps the ECU in the loop about exactly where the cams are in their rotation. With that timing info, the ECU can fire the injectors and spark at the right moment and, on models with variable valve timing, tweak cam advance for smooth power and good fuel economy. If the signal goes missing or skew-whiff, the Forester can struggle to start, run rough, drop power, or throw a check engine light with codes like P0340 or P0345.

It’s not a regular service item, but it’s smart to give it a thought during scheduled maintenance. Under the bonnet, check the sensor connector and loom for brittle insulation, oil contamination, or corrosion — common culprits behind intermittent faults. On the EJ253, the sensor is mounted on the cylinder head, the EJ255 turbo uses sensors on each bank. A quick visual once-over can save a roadside headache.

Replacement is straightforward for a competent DIYer or any workshop: disconnect the battery, unplug the connector, remove the retaining fastener, and ease the sensor out. Fit a quality sensor (genuine or reputable aftermarket), lightly oil any O-ring seal, and refit. After installation, clear fault codes and verify live data shows a stable cam signal. If a new sensor doesn’t fix it, look to the crank sensor, timing belt alignment, or wiring integrity — the ECU needs both crank and cam signals to play nicely together.

Pro tips:

• Rule out oil leaks wicking into the connector, clean with proper electrical contact cleaner.
• If the timing belt has recently been done and a cam code appears, re-check mechanical timing marks.
• Avoid harsh solvents on the sensor tip, if it’s damaged or oil-soaked internally, replacement is the go.

Where is the camshaft sensor on a 2010 Subaru Forester?

On the EJ253 non‑turbo, the cam sensor sits on the cylinder head (intake side), accessible from the top with the engine cover off. On the EJ255 turbo (XT), there’s a sensor on each bank near the front of the heads. Access may require moving intake ducting or covers, but it’s generally a simple reach with basic hand tools.

What symptoms show a failing camshaft sensor on this model?

Common signs include extended cranking, misfires, sudden loss of power, rough idle, and a check engine light with codes like P0340/P0341/P0345. Some faults are heat-related — it runs fine cold, then plays up once warm. Intermittent wiring issues can mimic a bad sensor, so always inspect the plug and harness.

Is it safe to drive with a faulty camshaft sensor?

If it starts and runs, the car may limp along, but it can stall or lose power without warning and may chew more fuel. Best to minimise driving and organise a fix promptly. Prolonged running with misfires can stress the catalytic converter, so sorting it early saves money down the track.