Parts for your 2009 Subaru Tribeca-Camshaft sensor

2009 Subaru Tribeca camshaft sensor — purpose, service advice, and common questions

Yes, the 2009 Subaru Tribeca (EZ36 3.6‑litre H6 petrol) uses camshaft position sensors, and they’re absolutely relevant to servicing and fault-finding on this model. Technical references that confirm fitment include the Subaru Factory Service Manual for the 2009 Tribeca (Engine Control/Diagnostics sections, which label them “Camshaft Position Sensor [Phase]”) and Subaru’s OEM parts catalogue listing separate camshaft sensors for Bank 1 and Bank 2. Reputable aftermarket catalogues (Bosch, NGK/NTK, and equivalent) also list direct-fit camshaft position sensors for the 2009 Tribeca.

On the Tribeca’s EZ36 engine, the camshaft sensors monitor the precise position of the camshafts so the ECU can sync fuel injection and ignition timing and control AVCS (Subaru’s variable cam timing). If a sensor goes out of spec, the ECU can’t accurately track valve timing. That can cause hard starting, rough running, a lack of punch off the line, poorer fuel economy, and a glowing check engine light with phase‑related DTCs such as P0340/P0341/P0345/P0346.

Routine replacement isn’t a scheduled service item, but inspection is smart when chasing drivability gremlins. Under the bonnet, they’re mounted on the cylinder heads (one per bank) and secured with a single retaining bolt and an O‑ring seal. Many issues blamed on a “bad sensor” turn out to be wiring, oil contamination inside the connector, or a poor earth. It pays to check those first.

• Common symptoms: extended crank or no‑start, intermittent stumble at low revs, sudden loss of power, increased fuel use, or erratic idle.
• Quick checks: look for damaged wiring/loom, oil wicking into the plug, cracked connector tabs, or metal debris on the sensor tip.
• Replacement tips: disconnect the battery, remove the engine cover for access, unplug the sensor, remove the retaining bolt, and twist the sensor free. Lightly oil the new O‑ring, install, and tighten to factory spec. Clear fault codes and road‑test. If AVCS had been confused by a failing sensor, expect the ECU to relearn over a short drive cycle.

Keeping oil changes on schedule and using the correct viscosity helps the AVCS system behave, which in turn keeps cam timing signals clean and predictable. If the Tribeca shows repeated phase‑sensor codes after replacement, a deeper look at timing, AVCS solenoids, and harness integrity is warranted.

FAQs

How many camshaft sensors does a 2009 Subaru Tribeca have?
The EZ36 H6 uses two camshaft position sensors, one for each cylinder bank. Each sensor feeds the ECU with position data used for fuel, spark, and AVCS control.

What are the usual signs of a failing camshaft sensor on a Tribeca?
Owners typically notice hard starting, a stumble off idle, flat spots under acceleration, higher fuel use, and a check engine light. Scan tools often show phase‑related codes (e.g., P0340/P0345). Always check the connector and wiring before condemning the sensor.

Can it be driven with a dodgy camshaft sensor?
It might run in a limp strategy, but performance and fuel economy will suffer, and stalling is possible. Best practice in Australia and New Zealand is to organise prompt diagnosis and repair rather than continuing to rack up kilometres.