Parts for your 2017 Subaru Outback-Camshaft sensor

2017 Subaru Outback camshaft sensor — what it does and when to sort it

Yes, a camshaft position sensor is fitted to the 2017 Subaru Outback. Both engines offered that year — the 2.5‑litre FB25 and 3.6‑litre EZ36 — use camshaft sensors. This is confirmed in Subaru’s Factory Service Manual for 2015–2019 Outback/Legacy (engine diagnostics listing DTCs P0340/P0341/P0345/P0346 for the camshaft position circuit), Subaru TechInfo (STIS) procedures, and the Subaru parts catalogue, which lists camshaft position sensors for both engines. Without these sensors, the ECU can’t correctly time fuel injection, ignition, or the AVCS variable valve timing.

The camshaft sensor tracks the exact position and speed of the camshaft(s), letting the ECU sync injection and spark with the crankshaft and adjust valve timing for smooth starts, good power, and tidy fuel economy. On the Outback’s boxer engines there are two cam sensors (one per bank), and they’re critical for cold starts, low‑rpm torque, emissions control, and overall drivability. When one plays up, the car may crank longer, run rough, drop into limp mode, or log a check‑engine light.

There’s no scheduled replacement interval — they’re “fit and forget” items — but they can age from heat, vibration, or oil contamination in connectors. Common warning signs include:

• Hard starting, stalling, or erratic idle
• Lazy throttle response and poor economy
• Check‑engine light with codes like P0340/P0341/P0345/P0346

Before replacing, it’s worth checking the basics: clean and reseat the connector, inspect the harness for chafing, and make sure engine oil is the correct grade and changed on time — dirty oil can upset AVCS behaviour and mimic sensor issues. If replacement is needed, quality matters: choose a genuine or reputable brand that matches the exact engine. The sensors are accessible near the front/top of each cylinder head, expect a simple remove‑and‑refit with a single retaining bolt and an O‑ring. Lightly oil the new O‑ring, install squarely, and tighten to Subaru’s specified torque. No special programming is usually required, clear the codes, start the engine, and take a short drive so the ECU relearns cam timing.

If codes return, look deeper: wiring continuity, timing chain alignment, and the cam trigger target. A quick scan‑tool check of live cam/crank sync data can save guesswork and keep that Outback happy over the next 100,000‑plus kilometres.

FAQs

Where is the camshaft sensor on a 2017 Outback?

On the 2.5i (FB25), each sensor sits near the front of the cylinder head by the timing chain cover — one on the left bank and one on the right. On the 3.6R (EZ36), you’ll find a sensor on the front of each cylinder bank near the intake cam area. Pop off the plastic engine cover and they’re easy to spot.

Can you drive with a bad camshaft sensor?

It might run, but it can stumble, stall, or go into limp mode. Driving like that isn’t wise — you risk poor economy, unpredictable performance, and potential catalyst damage if misfires persist. Best to diagnose and sort it promptly.

Do new camshaft sensors need programming?

Typically no. Fit the correct sensor, clear fault codes, and the ECU will sync automatically on startup. If issues linger, check wiring, connector condition, and mechanical timing rather than chasing software.