Parts for your 2009 Subaru Outback-Crank angle sensor

2009 Subaru Outback crank angle sensor — what it does and when to replace it

Yes, the 2009 Subaru Outback does use a crank angle sensor. Subaru’s own Factory Service Manual for the 2009 Outback/Legacy (Engine Diagnostics) specifies a crankshaft position sensor (commonly called a crank angle sensor) for the petrol EJ253 2.5i and EZ30 3.0R, and the EE20 diesel. Subaru’s parts catalogues list the CKP sensor for these engines, and the model’s diagnostic documentation includes OBD-II codes such as P0335 for crank sensor circuit faults. So it’s very much a relevant, fitted component on this model.

The crank angle sensor’s job is to tell the ECU exactly where the crankshaft is in its rotation and how fast it’s spinning. That live timing data is the backbone for fuel injection and spark on the petrol engines, and injection timing on the diesel. If the signal’s missing or messy, the Outback can be hard to start, stall, or run rough, and it’ll usually log a fault code.

It’s not a regular “service item” like oil or filters, but it does deserve attention during routine servicing. A quick visual once-over goes a long way: check the sensor body and connector (mounted at the front of the engine near the crank sprocket on the EJ and EZ engines) for oil contamination, cracked wiring insulation, or a loose plug. Keep the connector clean and seated, and avoid routing other wires tightly across it.

Replacement is straightforward for most variants and sits well within a weekend spanner session:

• Disconnect the battery to protect the ECU.
• Unplug the sensor connector and remove the single retaining bolt.
• Swap in the new sensor, ensure the O-ring is clean and lightly lubricated, then refit the bolt and tighten to factory spec.
• Clear any stored codes and confirm a clean crank signal with a scan tool.

Common signs the crank angle sensor needs love include extended cranking when cold, random stalling at idle, a dead tach during cranking, and the MIL on with a P0335-series code. Because heat and vibration live right where this sensor sits, age can take its toll on the internal magnet and the wiring. When in doubt, proper diagnosis with live data (RPM during cranking) and a scope trace of the CKP signal will save guesswork.

If the vehicle’s done big kilometres, pairing a new crank sensor with a fresh cam sensor can restore crisp starting and smooth running, especially on high-mileage EJ25s. Always use quality parts that match the original spec.

Popular questions

1) What are the symptoms of a failing crank angle sensor on a 2009 Outback?
Drivers often notice hard starting, intermittent stalling, rough idle, or the check engine light. A scan will typically show P0335 or related codes, and the tachometer may not move while cranking.

2) Where is the crank angle sensor located on the 2009 Outback?
On the EJ25 and EZ30 petrol engines it’s mounted at the front of the engine, reading a tone wheel on the crank. Access is from the top with the intake snorkel out of the way. Diesel models also have a CKP sensor in a similar front-engine position.

3) Should the crank angle sensor be replaced as preventative maintenance?
It isn’t scheduled maintenance. Replace it when there are symptoms or confirmed faults. That said, on high-kilometre vehicles, a proactive replacement with a quality unit can be worthwhile if there’s a history of intermittent no-starts.