Parts for your 2015 Subaru Xv-Camshaft sensor

2015 Subaru XV camshaft sensor — what it does and when to replace it

Yes, the 2015 Subaru XV (also sold as Crosstrek) is fitted with camshaft position sensors. Technical references confirming this include the Subaru Factory Service Manual for the FB20 engine (Engine Diagnostics section for DTCs P0340/P0345, Camshaft Position Sensor “A/B” Circuit), Subaru’s OBD-II diagnostic listings, and the Subaru parts catalogue for FB-series engines. The FB20 uses two camshaft position sensors (one on each cylinder head’s intake cam) and a crankshaft position sensor to manage sequential fuel injection and AVCS variable valve timing.

The camshaft sensor’s job is to tell the engine control module exactly where each intake cam is in relation to the crank. That timing info lets the ECU fire injectors and spark precisely, tweak valve timing for smoother idle and better torque, and keep fuel use and emissions tidy. If the sensor signal goes missing or messy, the XV can run rough, start hard, feel flat under load, or light the check engine lamp with codes like P0340 or P0345. Correlation codes (P0016–P0018) can appear if timing or oil control to the cam phasers isn’t happy.

The sensor isn’t a scheduled service item, but it’s smart to give it a look during regular servicing—especially if there’s oil weeping from the O-ring or if the connector boots are brittle. On these Subarus, age, heat, or oil contamination at the connector are the usual culprits rather than outright sensor failure.

• Symptoms to watch: hard starting, misfires at idle, sluggish performance, poor economy, or a fresh check engine light with cam/crank or VVT codes.
• Quick checks: confirm clean engine oil of the correct grade, inspect the sensor plugs and wiring for oil, corrosion or a loose fit, and scan live data for stable cam angle signals.

When replacement’s needed, it’s a straightforward job under the bonnet: disconnect the battery negative, remove the engine cover, unplug the sensor, undo the retaining bolt, swap the O-ring if required, refit, and tighten to the factory spec noted in the Subaru manual. Use a quality OEM-equivalent sensor, clear the codes, and perform a short drive cycle so the ECU relearns cam timing. Hybrid models also use cam sensors, standard HV safety steps apply if any high-voltage work is being done, though the sensor itself sits on the engine like the non-hybrid.

In Aussie and Kiwi workshops, expect around half to one hour per sensor plus parts. If codes persist after replacement, check the oil control valves and timing correlation before chasing wiring deeper.

Popular questions about 2015 Subaru XV camshaft sensors

Does the 2015 XV have more than one camshaft sensor?
Yes. The FB20 uses two camshaft position sensors, one on each cylinder head for the intake cams. They sit near the front of each head and read a trigger on the cam to report precise position to the ECU.

Will old or wrong engine oil cause camshaft sensor faults?
It can. Poor oil condition affects the AVCS cam phasers and oil control valves, which can trigger cam/crank correlation or performance codes that look like sensor faults. Always rule out oil grade/age and AVCS valve issues before condemning a sensor.

What should be done after replacing a camshaft sensor?
Clear fault codes, start the engine, confirm stable idle, and check live data for steady cam signals. A short road test with varied speeds helps the ECU relearn cam timing. If a code returns, recheck the connector, O-ring seating, and wiring back to the ECU.