Parts for your 2014 Subaru Legacy-Camshaft sensor

2014 Subaru Legacy camshaft sensor: what it does and how to look after it

Yes, the 2014 Subaru Legacy uses camshaft position sensors. This is confirmed by Subaru’s factory service manual for MY2014 Legacy/Outback, which details Camshaft Position Sensor diagnostics (including DTCs P0340/P0341/P0345), and by the Subaru electronic parts catalogue listing genuine camshaft position sensors for both the FB25 2.5‑litre flat‑four and the EZ36 3.6‑litre H6. These sources make it clear the sensor is fitted and critical to engine management.

The camshaft sensor tells the engine control unit exactly where each cam is in its rotation so the ECU can time fuel injection, spark, and the Legacy’s variable valve timing (AVCS) with precision. Paired with the crank sensor, it gives the ECU the sync it needs for smooth starts, crisp throttle, good fuel economy, and clean emissions. When it’s on the fritz, the Legacy might crank longer, run rough, lose power, or even drop into limp mode.

Common signs a cam sensor needs attention include:

• Check Engine Light with codes like P0340, P0341 or P0345
• Hard starting (often worse hot), rough idle, hesitation, or stalling
• Poor fuel economy and sluggish performance

It’s not a scheduled replacement item, but it’s worth a quick look under the bonnet at service time. Check for oil weeping around the sensor’s O‑ring, brittle wiring, or a loose connector. On the FB25, there are typically two sensors (one per cylinder bank) mounted near the front of the heads, the H6 also uses cam sensors per bank. Replacement is straightforward with basic tools:

1. Disconnect the negative battery terminal.
2. Unplug the sensor connector and remove the single hold‑down bolt (commonly 10 mm head).
3. Twist and withdraw the sensor, catch the O‑ring.
4. Lightly oil a new O‑ring, seat the new sensor, and tighten the bolt to the service‑manual torque.
5. Reconnect, clear codes with a scan tool, and road‑test, perform idle relearn if needed.

If faults persist, inspect the harness for damage and verify crank sensor operation and timing marks before throwing more parts at it. Given how sensitive Subaru ECUs are to signal quality, stick with genuine or reputable aftermarket sensors. Avoid blasting the connector with harsh solvents, a light touch and a dab of dielectric grease on reassembly goes a long way for reliability across Kiwi and Aussie kilometres.

Where is the camshaft sensor on a 2014 Subaru Legacy?

On the 2.5‑litre FB25, there’s one sensor on each cylinder head near the front. They’re accessible with the intake ducting out of the way. The 3.6‑litre H6 also uses sensors on each bank. Look for a small, two‑pin sensor held by a single bolt.

Can it be driven with a dodgy camshaft sensor?

Often it will start and run, but it may hesitate, use more petrol, or stall at idle. Prolonged driving can risk catalytic converter damage from misfires, so it’s best to get it diagnosed and sorted promptly.

How many camshaft sensors does a 2014 Legacy have?

Most FB25‑equipped cars run two (one per bank). The H6 also employs cam sensors per bank. The exact count and part supersessions can be confirmed by VIN in the Subaru parts catalogue.