Parts for your 2015 Subaru Impreza-Crank angle sensor

2015 Subaru Impreza crank-angle sensor: what it does and how to look after it

Yes, the 2015 Subaru Impreza is fitted with a crank-angle sensor (more commonly called a crankshaft position sensor). Technical references that confirm this include the Subaru Factory Service Manual for the 2015 Impreza/FB engine, which details diagnostics for DTC P0335 “Crankshaft Position Sensor Circuit,” and Subaru’s parts catalogues that list a dedicated crankshaft position sensor for this model. Those sources make it clear the sensor is part of the standard engine management on the 2.0‑litre FB20.

This little sensor does big work. It tracks the exact position and speed of the crankshaft so the ECU can fire the ignition and inject fuel at precisely the right time. Paired with the cam sensors, it keeps the Impreza idling smoothly, starting reliably, and pulling cleanly through the revs. If it drops out, the engine may crank but won’t start, or it might stall and throw the check engine light.

There’s no set replacement interval in normal servicing. Instead, it’s a case of inspect, test, and replace when fault codes or symptoms point to it. As part of routine servicing, it’s smart to:

• Scan for codes like P0335/P0336 and check live data.
• Inspect the connector and harness under the bonnet for oil contamination, heat damage, or chafing.
• Address oil leaks promptly so they don’t soak the sensor or plug.

On the 2015 Impreza, the crank sensor sits at the rear of the engine near the bellhousing, accessed from up top by the firewall. Replacement is straightforward with basic tools: disconnect the battery, unplug the connector, remove the retaining bolt, and ease the sensor out. Lightly oil the new O‑ring, seat the new unit, tighten the bolt to factory spec from the Subaru service manual, reconnect, clear codes, and road test. Always use quality OEM-equivalent parts and avoid forcing the sensor into its bore.

Common red flags include extended cranking, intermittent stalling when hot, a dead or jumpy tacho, rough running, and increased fuel use. Because wiring faults can mimic a failed sensor, a proper diagnosis—visual checks plus scan-tool data and, if needed, a scope pattern—will save time and coin.

Quick tips:

• Let the engine cool before working near the firewall.
• Use dielectric grease on the connector seal if recommended.
• Secure loom routing so it can’t rub on brackets over thousands of kilometres.

Where is the crank-angle sensor on a 2015 Subaru Impreza?

It’s mounted at the rear of the engine near the bellhousing, accessible from the top by the firewall. You’ll see a small sensor held by a single bolt, with a two- or three‑pin connector. Removing the intake ducting may improve access on some trims.

Does the crank-angle sensor need regular replacement?

No scheduled replacement is specified. It’s a monitor-and-replace item: check for codes, inspect the plug and wiring, and only replace the sensor when diagnostics confirm it’s faulty. Using quality parts and keeping oil leaks at bay helps it last the distance.

What symptoms or fault codes point to a bad crank-angle sensor?

Typical signs are long cranking or a no-start, sudden stalling, a dead tacho, and the MIL on. Common codes include P0335 and P0336. Because wiring issues or a damaged reluctor can cause similar symptoms, verify with proper testing before fitting a new sensor.