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Parts for your 2013 Subaru Impreza-Camshaft sensor
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2013 Subaru Impreza Camshaft Sensor: Purpose, Care, and Replacement
Based on Subaru’s Factory Service Manual (FSM) for the FB-series 2.0L engine and Subaru’s electronic parts catalogue for the 2012–2014 Impreza, the 2013 Subaru Impreza is fitted with camshaft position sensors. In fact, the FB20 engine uses two camshaft sensors (one on each cylinder head) to support its dual Active Valve Control System (AVCS). Those sensors let the engine control module know exactly where the cams are, which is essential for smooth starts, clean emissions, and crisp performance.
What do they actually do? The camshaft sensors read a toothed target on the cam sprockets and feed timing data to the ECU. That data is matched with the crank angle so the car can fire the spark, inject fuel, and phase the variable valve timing right on cue. When they’re healthy, cold starts are tidy, fuel economy stays sharp, and the Impreza pulls cleanly through the revs.
- Common warning signs include a check engine light (often codes like P0340/P0365), hard starting, rough idle, flat spots, or higher fuel use.
- Intermittent stalling or limp-home behaviour can also point to a sensor or wiring issue.
As part of routine servicing, there’s no scheduled replacement for the cam sensors, but a quick visual once-over pays off. Under the bonnet, check each sensor’s connector for oil wicking, brittle insulation, or loose fitment. Regular oil changes with the correct grade keep AVCS actuation and sensor signals stable, because old oil can make cam timing erratic and confuse the ECU. If a fault code appears, confirm with live data, check the harness, and only then replace the sensor.
- Disconnect the battery and remove the engine cover for access at the rear of the heads.
- Unplug the sensor and remove its single retaining bolt, note there are left and right sensors—don’t mix them up.
- Lightly oil the new O-ring, seat the sensor squarely, and tighten the bolt to factory spec (around 7–9 N·m).
- Reconnect, clear codes, and perform a short drive so the ECU can relearn cam/crank correlation.
Quality matters: an OEM or reputable-brand sensor avoids nuisance faults. If a new sensor doesn’t sort the issue, look for wiring damage, poor grounds, or a mechanical timing/VVT problem before throwing more parts at it.
Popular questions about the 2013 Subaru Impreza camshaft sensor
Where is the camshaft sensor on a 2013 Impreza?
It’s mounted at the back of each cylinder head on the FB20 engine, tucked near the bulkhead under the plastic engine cover. There are two sensors—one per head—so make sure you identify the correct side before removal.
Access is from above with the cover off. A small socket or spanner is all that’s usually needed to remove the retaining bolt and unplug the connector.
Can a camshaft sensor be cleaned, or does it need replacing?
If the fault is from a dirty connector or light oil contamination on the tip, careful cleaning can restore operation. However, internal sensor failures or damaged wiring won’t be fixed by cleaning, and replacement is the proper repair.
Always check for oil wicking into the loom from nearby seals—clean the connector, fix the leak, and use the correct oil to keep AVCS happy.
Is it safe to drive with a failing camshaft sensor?
The car may still run, but it can be hard to start, run roughly, or fall back to limited performance. Prolonged driving risks poor fuel economy and potential catalytic converter stress.
It’s best to diagnose and repair promptly. If the engine starts stalling or goes into limp mode, arrange a tow rather than pushing on.
