Parts for your 2007 Subaru Impreza-Camshaft sensor

2007 Subaru Impreza camshaft sensor — what it does and how to look after it

Technical sources confirm the 2007 Subaru Impreza is fitted with a camshaft position sensor. The Subaru 2007MY Impreza Factory Service Manual (Engine Diagnostics: DTC P0340/P0341 Camshaft Position Sensor Circuit), the Subaru Technical Information System (STIS), and the Subaru Electronic Parts Catalogue for this model all list camshaft sensor(s) across the EJ engines used that year. Non‑turbo SOHC models run a single cam sensor, while WRX/STI variants with AVCS use sensors on the intake cams.

This little sensor does big work. It reads the cam’s position and feeds that to the ECU so fueling and spark timing happen exactly when they should. Paired with the crank sensor, it lets the ECU run sequential injection, keep idle stable, and manage AVCS on models that have it. It also helps with clean starts, smooth throttle response, and better fuel economy. When it goes on the fritz, it can throw a check engine light, log codes like P0340/P0341 or AVCS correlation faults, and cause rough running, misfires, hard starting or stalling.

There’s no scheduled replacement interval for the camshaft sensor on a 2007 Impreza, but it’s smart to give it a look during regular servicing—especially if there’s oil weeping under the bonnet or the car’s doing higher kilometres. The sensor itself is solid-state and usually either works or doesn’t, issues often come from heat, vibration, or oil contamination at the connector.

• Inspection tips: check the harness for brittle insulation, nicks, or oil ingress, make sure the connector is clean and pins are tight. A light spray of electrical contact cleaner and a dab of dielectric grease on the seal can help keep moisture out.
• Replacement basics: disconnect the battery negative, unplug the sensor, remove the retaining bolt, and swap it over with a new O‑ring. Refit to factory torque and clear any fault codes. No special relearn procedure is typically needed.
• Location notes: on SOHC 2.5i it’s mounted on the cylinder head, on WRX/STI AVCS models there’s one on each intake cam. Access varies—sometimes a simple 10 mm spanner job, other times a bit more fiddly.
• Quality matters: stick with genuine or reputable OEM‑equivalent sensors to avoid intermittent faults.

If symptoms persist after replacement, double‑check the crank sensor and timing belt alignment, as the ECU needs consistent signals from both to stay happy.

Technical sources referenced: Subaru 2007MY Impreza Factory Service Manual (Engine Diagnostics: Camshaft Position Sensor, DTC P0340/P0341), Subaru Technical Information System (STIS), Subaru Electronic Parts Catalogue listings for 2007 Impreza camshaft position sensor(s) and related harness components.

Popular questions about 2007 Subaru Impreza camshaft sensors

How can someone tell if their 2007 Impreza’s camshaft sensor is failing?

Common signs include hard starting, stalling at idle, uneven acceleration, poor fuel economy, and a check engine light with codes like P0340 or P0341. A scan tool showing an erratic or missing cam signal while cranking is a giveaway. Always rule out wiring damage and oil in the connector first.

Is it safe to keep driving with a dodgy camshaft sensor?

It might run, but it’s not ideal. The engine can stumble, stall at intersections, or switch to a limp strategy that hurts performance and economy. Best bet is to address it promptly to avoid getting stuck or masking other timing-related issues.

Do WRX and STI versions have more than one camshaft sensor?

Yes. 2007 WRX/STI models with AVCS use a camshaft position sensor on each intake cam. The non‑turbo 2.5i generally uses a single cam sensor. Fault codes and wiring diagrams in the service manual specify which bank or sensor is affected.