Parts for your 2018 Subaru Xv-Camshaft sensor

2018 Subaru XV camshaft sensor — what it does and when to replace it

The 2018 Subaru XV (Crosstrek in some markets) absolutely uses camshaft position sensors. Subaru’s workshop literature for the FB20 engine lists “Camshaft Position Sensor RH/LH” with related diagnostics such as DTC P0340/P0345, and the Subaru electronic parts catalogue shows two camshaft sensors fitted, one on each cylinder head. Independent data services that mirror factory procedures also include tests and wiring for these sensors. So yes — it’s a relevant part on the 2018 Subaru XV.

On this model, the camshaft sensor feeds the engine control module live data on cam angle and timing, working alongside the crank sensor. That info lets the ECU fire the injectors and coils at the right moment and manage Subaru’s AVCS (variable valve timing). When healthy, it helps the XV start cleanly, idle smoothly, pull well through the revs and hit its fuel economy targets.

It’s not a scheduled replacement item, but it does deserve attention during servicing. A technician will generally: check for stored fault codes, inspect the connectors for oil wicking or corrosion, confirm the harness isn’t rubbing through near the back of the heads, and make sure the sensor’s O-ring isn’t weeping. Quality engine oil and timely changes also matter, as varnish and debris can upset cam timing control and confuse diagnostics even if the sensor itself is fine.

• Common clues the 2018 Subaru XV camshaft sensor is playing up: longer cranking, uneven idle, sudden loss of power, poor fuel economy, or the MIL on with codes like P0340/P0345.
• Replacement is straightforward: disconnect the battery, unplug the sensor, remove the single retaining fastener, swap the sensor and O-ring, then clear codes and verify live data and cam/crank sync. Use a quality OEM-equivalent part.
• If one sensor fails, it’s fine to replace just that side, but confirm the root cause first (connector, oil ingress, harness, or sensor).

Location-wise, both camshaft sensors sit on the rear of the cylinder heads. Access is typically from above once the intake ducting is out of the way. A quick visual during each service can prevent niggling drivability issues turning into bigger headaches.

Popular questions about the 2018 Subaru XV camshaft sensor

Where is the camshaft sensor on a 2018 Subaru XV?
It’s mounted on each cylinder head at the back of the engine — one on the left bank and one on the right. With the engine cover off and the intake snorkel removed, they’re accessible from the top near the firewall.

Do both camshaft sensors need to be replaced together?
Not usually. If diagnostics point to one side (and the wiring and connectors check out), replacing that single sensor is acceptable. Some owners choose to do both due to age or convenience, but it’s not mandatory.

Can a bad camshaft sensor damage the engine?
It’s unlikely to cause mechanical damage on its own. However, it can trigger hard starting, misfires, and rough running. Left unresolved, those symptoms can stress other components, so it’s best sorted promptly.