Parts for your 2017 Subaru Forester-Crank angle sensor

2017 Subaru Forester crank angle sensor (crankshaft position sensor)

Yes, the 2017 Subaru Forester is fitted with a crank angle sensor — Subaru labels it the Crankshaft Position Sensor (CKP). This is confirmed in the Subaru Factory Service Manual for 2017MY Forester (Engine Diagnostics: ECM I/O Signal – Crankshaft Position Sensor) and by standard Subaru OBD-II fault coverage for P0335–P0339. Subaru’s genuine parts catalogue for 2017 Forester variants (FB25 2.5i and FA20F 2.0XT, plus applicable diesel trims in some markets) lists a “Sensor – Crankshaft” in the 22053AA0xx range, so it’s absolutely a relevant and used component on this model.

On the 2017 Forester, the crank angle sensor is the engine’s timekeeper. It reads a toothed target on the crankshaft and tells the ECU exactly where the pistons are and how fast they’re spinning. With that info, the ECU times spark and fuel precisely, coordinates variable valve timing, and keeps the engine running smoothly and efficiently. If the signal goes missing or gets noisy, you’ll typically see a hard start or no-start, stalling, misfires, and a Check Engine Light with a CKP-related code.

There’s no scheduled replacement interval for the CKP on this Subaru, it’s a “replace on condition” item. During routine servicing, it’s smart to give the harness and connector a quick once-over: look for oil wicking into the plug, damaged wiring near the sensor, or heat-baked loom. The sensor’s mounting and air gap are fixed by design, so if the bolt is secure and there’s no physical damage, it should just get on with the job for many kilometres.

If replacement is needed, the job is straightforward for a competent DIYer or any workshop. Expect: disconnect the battery, gain access (location varies slightly by engine variant), unplug the loom, remove a single retaining bolt, swap the sensor (and O-ring/seal if supplied), then refit and torque to spec per the Subaru manual. Clear fault codes and check live data, no ECU coding is required, and the ECU will pick up the signal immediately. It’s also worth inspecting the crank trigger wheel for debris or damage if issues persist.

• Common symptoms of a failing CKP: long crank/no start, sudden stall, rough idle or misfire, poor economy, CEL with P0335/P0336.
• Good practice: keep connectors clean and dry, route the loom away from hot exhaust bits, and use an OE-quality sensor for reliable operation.

Popular questions about the 2017 Subaru Forester crank angle sensor

Where is the crank angle sensor located on a 2017 Forester?
It’s mounted to the engine block where it can read a toothed ring on the crankshaft. Exact spot varies by engine: on petrol FB/FA engines it’s typically accessible from the front or upper side of the block, diesel layouts differ slightly. Access is usually from the top under the bonnet or from underneath with the vehicle safely raised.

Can you drive with a failing crank angle sensor?
Not a great idea. A weak or intermittent CKP signal can cause random stalling and hard starting, which is unsafe in traffic. If the sensor fails completely, the engine normally won’t start. If a CKP fault code appears, plan diagnosis and repair rather than pushing your luck.

Does the CKP need programming after replacement?
No coding is required. After installing an OE-spec sensor, clear any stored codes and start the engine. The ECU uses the new signal straight away. If the battery was disconnected, you may notice a brief idle relearn, which settles after a short drive.