Parts for your 2019 Subaru Legacy-Camshaft sensor

2019 Subaru Legacy camshaft position sensor: purpose, servicing and replacement

Yes, the 2019 Subaru Legacy does use camshaft position sensors. The Subaru 2019MY Legacy/Outback Service Manual (Engine Diagnostics) documents diagnosis for Camshaft Position Sensor circuit faults (e.g., DTCs P0340/P0341/P0345), and the Subaru Genuine Parts Catalogue lists camshaft position sensors for both the 2.5‑litre FB engine and the 3.6‑litre EZ engine. Those factory sources confirm the part is fitted and essential to engine management and Subaru’s AVCS variable valve timing.

On this model, the camshaft position sensor keeps the ECU in the loop about where each cam is in its rotation. That timing info is used to trigger spark and fuel with precision and to adjust AVCS for better torque, economy and emissions. If the signal goes missing or messy, the car can be hard to start, feel flat, or throw a check engine light.

Owners will typically find two sensors on the 2.5L FB (one per cylinder bank, reading the intake cam), and multiple on the 3.6R EZ. They sit near the top/rear of the heads under the plastic engine cover. They’re solid-state and maintenance-free—there’s no scheduled replacement interval in normal servicing.

That said, a quick look during a service goes a long way. Check the connector for oil ingress or brittle wiring, make sure the loom isn’t rubbing on the cover, and confirm the sensor’s O-ring isn’t weeping. If faults crop up, scan for codes like P0340/P0341/P0345 and confirm live data before calling the sensor. Wiring, poor earths or a stretched timing chain/belt correlation issue can mimic a crook sensor.

• Common symptoms of a failing cam sensor:
  • Long crank, misfire, rough idle or stall
  • Sluggish performance and higher fuel use
  • Check engine light with cam/crank correlation codes

Replacement is straightforward: disconnect the battery, remove the engine cover, unplug the connector, pull the retaining bolt, twist and withdraw the sensor. Lightly oil the new O‑ring, seat it cleanly, and torque the bolt to the factory spec. Clear codes and verify cam/crank sync in live data. Stick with quality OEM-equivalent parts—cheap sensors can cause intermittent grief. Most jobs take about an hour, but give yourself a bit of wiggle room if access is tight or if you’re working under the bonnet at home with basic spanners.

FAQs

How many camshaft sensors are on a 2019 Subaru Legacy?
Most 2.5L FB engines run two sensors—one per bank, typically reading the intake cams. The 3.6R EZ engine uses multiple sensors as well. Exact count and locations vary by engine, but all 2019 Legacy engines use camshaft position sensing for AVCS and ignition/fuelling control.

Is there a service interval for the camshaft sensor?
No scheduled interval. The sensors are designed to last the life of the vehicle. As part of routine servicing, it’s sensible to inspect connectors, wiring and the sensor O-ring for oil. Replace only if you have relevant fault codes or verified signal issues.

Can it be driven with a bad camshaft sensor?
It might run in a limp or fallback mode, but you risk hard starting, stalling and poor performance. It’s best to have it diagnosed promptly, prolonged driving with misfires can stress the catalytic converters and isn’t great for safety or the wallet.