Parts for your 2001 Subaru Forester-Camshaft sensor

2001 Subaru Forester camshaft sensor — what it does and when to sort it

Yes, the 2001 Subaru Forester is fitted with a camshaft position sensor. Subaru’s own Factory Service Manual for the 2001 Forester (EJ20/EJ25 engines) lists and tests this sensor, and includes OBD‑II trouble codes like P0340/P0341 for camshaft position faults. Subaru technical training for EJ‑series engine management and independent workshop manuals back this up, noting its role in phase detection for ignition timing and sequential fuel injection.

On these EJ engines there’s a single camshaft position sensor reading a target on the cam sprocket. The ECU uses that signal to know which stroke each cylinder is on, so it can fire the injectors and coils at the right moment. If the signal goes walkabout, the Forester may crank longer before starting, run roughly, drop into fail‑safe, or not start at all. You’ll usually see the check engine light and a stored code.

It’s essentially maintenance‑free, but it’s smart to give it some attention during regular servicing—especially when you’re under the bonnet for timing belt work. Common issues aren’t the sensor itself so much as age‑hardened O‑rings, oil contamination, or a tired connector. Keeping the cam cover area dry and the harness tidy helps.

• Typical symptoms: hard starting, misfires, poor fuel economy, intermittent stalling, and DTCs P0340/P0341.
• Where it lives: usually on the left‑hand cylinder head near the front, by the timing cover—easy to spot once the engine cover’s off.

Replacement is straightforward for a home mechanic: disconnect the battery, unplug the sensor, remove the retaining bolt, and ease the sensor out. Lightly oil the new O‑ring, seat the new unit, reconnect, and tighten the bolt to the factory spec. Clear codes with a scan tool and let the car idle so the ECU can relearn. If faults persist, inspect the wiring back to the ECU and confirm timing belt alignment, as a jumped tooth can mimic sensor drama.

Genuine or high‑quality aftermarket sensors are worth it—cheapies can cause flaky signals. There’s no set replacement interval, but treating the camshaft sensor as an inspect‑and‑replace‑if‑needed item during timing belt services is a good shout for Aussie and Kiwi Foresters racking up the kilometres.

Popular questions

Where is the camshaft sensor on a 2001 Subaru Forester?
It’s typically mounted on the left‑hand (driver’s side in AU/NZ) cylinder head at the front, adjacent to the timing belt cover. Look for a small sensor held in with a single bolt and a two‑ or three‑pin connector. Access is under the bonnet with the plastic engine cover removed.

Can you keep driving with a faulty camshaft sensor?
It might run, but it can stumble, stall, or be hard to restart. You risk poor fuel economy and rough running that can stress the catalytic converter. Best to diagnose and fix promptly rather than pressing on and hoping for the best.

Do you need to program a new camshaft sensor?
No special programming is required. Fit the sensor, reconnect, and clear the codes. A short idle period helps the ECU settle its trims. If the light returns, double‑check wiring and mechanical timing rather than blaming the new part straight away.