Parts for your 2021 Subaru Xv-Crank angle sensor

2021 Subaru XV crank-angle sensor (crankshaft position sensor)

Based on technical sources including the Subaru Global/Regional Service Manual (STIS) for the 2021 XV/Crosstrek engine diagnostics (DTC P0335/P0336) and Subaru’s OEM parts catalogue for the FB-series engines used in the XV, this model is fitted with a crankshaft position sensor—commonly called a crank-angle sensor. It’s a core engine-management input and absolutely relevant to the 2021 Subaru XV.

The crank-angle sensor tracks the exact position and speed of the crankshaft so the ECU knows when to fire the spark and deliver fuel. On the XV’s FB engine, it works in tandem with the cam sensors to keep timing spot-on from cold start to highway cruising. It also helps the ECU detect misfires, stabilise idle, and coordinate functions like stop–start and, on hybrid variants, smooth engine restarts. Without a clean signal from this sensor, the engine may crank without firing, run roughly, or drop into limp mode.

There’s no scheduled replacement interval for the crank-angle sensor on a 2021 XV—it’s designed to last the life of the vehicle. As part of routine servicing, a smart workshop will visually check the wiring and connector for chafing, oil contamination, or moisture, especially after other engine work. If the Check Engine light pops on with codes like P0335/P0336, proper diagnosis should confirm whether the sensor, its reluctor target, or the wiring is at fault before parts are swapped.

• Common symptoms of a failing crank-angle sensor:
  • Long crank or no-start
  • Intermittent stalling or rough idle
  • Flat spots under acceleration
  • Check Engine light with timing/speed sensor codes (e.g., P0335, P0336)

Replacement is straightforward for a trained tech: disconnect the battery, unplug the sensor, remove the retaining fastener, swap the sensor and O-ring if fitted, then torque to factory spec. The ECU typically doesn’t need special programming, clear fault codes and perform a short drive cycle to verify stable signal and idle. For reliability, stick with a genuine or high-quality OEM-grade sensor, route the harness exactly as per the factory layout, and keep the connector clean and dry. If symptoms are intermittent, don’t ignore them—an on-again, off-again crank signal can escalate to a no-start at the worst time.

Does the 2021 Subaru XV actually have a crank-angle sensor?

Yes. Subaru’s service manual for the 2021 XV/Crosstrek lists the crankshaft position sensor (often referred to as a crank-angle sensor) as a critical input for ignition and injection timing, with diagnostics covering DTC P0335/P0336. The OEM parts catalogue also includes this sensor for the FB engine family used in the XV.

When should the crank-angle sensor be replaced on a 2021 XV?

There’s no scheduled interval, it’s replaced on condition. If you see a Check Engine light with relevant codes, experience hard starting, stalling, or rough running, have the fault confirmed. Many issues are harness- or connector-related, so a proper test comes first. When replacement is needed, use a genuine or OEM-grade part and have the fault memory cleared and verified with a road test.

Is it safe to drive with a failing crank-angle sensor?

It might run, but it’s risky. A weak or intermittent signal can cause sudden stalling or a no-start after a short stop. If the engine light’s on with P0335/P0336 or symptoms are clear, organise diagnosis promptly. If the car won’t start or stalls repeatedly, towing is the sensible option to avoid getting stranded.