Parts for your 2010 Subaru Forester-Crank angle sensor

2010 Subaru Forester crank angle sensor

Yes — the 2010 Subaru Forester is fitted with a crank angle sensor, more commonly called the crankshaft position (CKP) sensor. This is confirmed by the Subaru Factory Service Manual for the 2010 Forester (STIS) which details diagnostics for DTCs P0335 and P0336 relating to the CKP sensor, and by Subaru’s genuine parts catalogue listing a crankshaft position sensor for this model. General technical references such as the Bosch Automotive Handbook describe its role in engine timing on modern fuel‑injected vehicles.

On the 2010 Forester’s EJ25 engine, the crank angle sensor monitors crankshaft speed and position by reading a toothed reluctor on the crank. The engine control module uses that signal to time spark and fuel injection to the exact degree. If the signal drops out or goes noisy, the Forester can be hard to start, stumble, misfire, or not run at all. The dash may light the check engine lamp and store P0335/P0336.

It isn’t a scheduled maintenance item, but it does live in a hot, vibrating spot near the timing area, so age, heat soak and oil contamination can take a toll. As part of regular servicing, it’s smart to:

• Visually check the sensor connector and loom for brittle insulation, oil ingress or chafing.
• Make sure the sensor mount is clean and free of debris so the air gap stays consistent.
• Scan for pending fault codes after long trips or if there have been hard‑start episodes.

If replacement is needed, it’s a straightforward job for a competent DIYer, but many owners prefer a workshop. Always use an OEM‑quality sensor — cheap pattern parts can cause intermittent cut‑outs.

1. Disconnect the battery negative and let the car sit a few minutes.
2. Gain access at the front of the engine near the crank pulley/timing cover.
3. Unplug the sensor, remove the retaining bolt, and withdraw the sensor.
4. Wipe the mounting face, lightly oil the O‑ring if fitted, install the new sensor, and tighten the bolt to the factory spec from the service manual.
5. Reconnect the plug and battery, then start and check for codes. The Forester’s ECU typically doesn’t need special calibration, it will relearn after a few warm‑up cycles.

Typical failure signs owners notice include intermittent stalling when warm, a dead rev counter during crank, extended cranking after refuelling, or random misfires. If those pop up, a proper scan and a quick look under the bonnet can save a tow.

Popular questions about 2010 Subaru Forester crank angle sensor

Where is the crank angle sensor on a 2010 Forester?
It’s mounted at the front of the engine, reading the crank timing sprocket behind the crank pulley/timing cover area. Access usually involves removing intake ducting or covers for a clear line to the sensor and its single retaining bolt.

Because space is tight, a small 10 mm spanner or socket helps, and unplugging the connector before unbolting the sensor makes life easier.

What symptoms point to a failing crank sensor on this model?
Common clues are hard starting when hot, sudden stalling, a dead or jumping tacho while cranking, rough idle, or no‑start with a check engine light. Scanning will often show P0335 or P0336.

Intermittent issues can be caused by heat‑soaked sensors or cracked wiring near the plug, so a wiggle test on the loom and a close visual check are worthwhile.

Does the ECU need a relearn after replacing the sensor?
Generally no special programming is required on a 2010 Forester. The ECU adapts after a few normal drive cycles. Clear any stored codes, let it idle to warm, then take it for a short drive covering light and moderate throttle.

If codes immediately return, recheck the connector, mounting, and ensure the replacement sensor is OEM‑quality.