OEM Camshaft Position Sensor Assembly for Subaru
Why this part is needed
This sensor tells the engine computer the exact camshaft position. With that data, the ECU sets injection timing, spark timing, and AVCS (Subaru variable valve timing). The result is quick starts, smooth idle, clean emissions, and full power. Without a precise cam signal, the engine can’t stay in perfect sync.
How it works
Inside is a Hall-effect pickup that reads a trigger wheel on the cam. As the cam turns, the sensor sends clean digital pulses. The ECU uses these pulses to match cam and crank, choose the correct cylinder for fuel and spark, and command the oil control solenoids for VVT. The unit is heat-stable, sealed against oil, and uses a factory connector and O-ring for a tight, leak-free fit.
What happens if it fails ⚠️
Common signs: hard start or no start, rough idle, stalling, hesitation, poor fuel economy, weak power, and a Check Engine Light (often P0340/P0341). Long-term driving like this can damage the catalytic converter due to misfires. Inspect wiring for oil soak or cracks. Replacement is plug-and-play: one bolt out, swap sensor, seat O-ring, reconnect, then clear codes and perform an idle relearn if needed.
Choose an OE-grade unit for accurate timing signals and long life in hot boxer engine bays. ✅
Compatibility
- Legacy
- Xv
- Forester
- Impreza
