Parts for your 2021 Subaru Xv-Camshaft sensor

2021 Subaru XV camshaft sensor — what it does and how to look after it

Yes, the 2021 Subaru XV is fitted with camshaft position sensor(s). This is confirmed by Subaru’s service literature for the GT-series XV/Crosstrek (Engine Diagnostics sections for DTCs P0340/P0345 “Camshaft Position Sensor” on the FB20/FB20 e-Boxer), and by the Subaru OEM parts catalogue, which lists camshaft position sensor components for this model. The FB-series engine uses Dual AVCS (variable valve timing), which relies on cam angle feedback — another technical cue that a camshaft sensor is present and essential.

The camshaft sensor tells the engine control unit exactly where the cam(s) sit relative to the crank. On the XV’s FB20 boxer engine, that info is critical for quick starts, precise fuel injection, coil timing, and for the AVCS system to advance or retard valve timing on the fly. Paired with the crank sensor, it keeps the engine smooth, grunty, and efficient from school runs to motorway climbs.

When a cam sensor starts to go flaky, the XV may crank longer before firing, stumble at idle, feel flat, or pop the check engine light. Common fault codes include P0340/P0345 and sometimes cam/crank correlation codes. If left alone, it can tip the car into limp mode or stall at lights — not ideal.

Good news: it’s not a scheduled service item, so there’s nothing to replace unless there’s a fault. As part of routine servicing, a smart workshop will:

• Scan for stored or pending cam/crank and AVCS codes, even if the light’s off.
• Inspect the sensor connectors and wiring for oil wicking, heat damage, or loose pins.
• Check for oil leaks around the sensor body/O-ring on the head.

Replacement is straightforward for a competent DIYer or tech: disconnect the battery, pop off the engine cover, unplug the sensor on the front of the cylinder head, remove the hold-down bolt, swap in the new unit with a fresh O-ring, and tighten to the factory torque spec. Keep the mating face clean, route the loom exactly as Subaru does, and avoid mixing up left/right connectors on DOHC motors. Afterward, clear codes and verify live data, the XV typically doesn’t need adaptations, but a short road test to confirm stable cam angle targets is the go. Stick with genuine or high-quality aftermarket parts that match the VIN to keep timing control crisp and reliable.

Where is the camshaft sensor on a 2021 Subaru XV?

On the FB20-powered XV, the camshaft sensor(s) sit at the front of the cylinder head(s), near the cam sprockets, under the plastic engine cover. They’re accessible from the top — unplug, one small bolt, then out. Hybrid e-Boxer layouts are similar, with slightly tighter access on some trims.

Does the camshaft sensor need regular replacement?

No. It’s not a routine service item. Replace it only if diagnostics point to a faulty sensor or wiring. During services, a quick scan for related fault codes and a visual check of the connector and O-ring area is all that’s usually needed.

Is it safe to drive with a bad camshaft sensor?

It may start and run, but it can stall, hesitate, or drop into limp mode. That’s risky in traffic and can lead to rough running that’s hard on the catalytic converter. Best to diagnose and repair sooner rather than later.