Parts for your 2019 Subaru Impreza-Camshaft sensor

2019 Subaru Impreza Camshaft Sensor

Based on Subaru factory service information for the MY2019 Impreza with the FB20 engine (Engine Diagnostics and ECM sections), plus genuine Subaru parts catalogue listings for “Camshaft Position Sensor RH/LH,” the 2019 Subaru Impreza is fitted with camshaft position sensors. Diagnostic routines for DTCs such as P0340/P0341/P0345/P0346 in the Subaru manual further confirm their presence and critical role.

The camshaft sensor on a 2019 Subaru Impreza helps the engine computer know exactly where each cam is relative to the crankshaft. On the FB20 engine with AVCS (variable valve timing), that signal is essential for spot-on fuel injection timing, spark timing, and cam phasing. Paired with the crank sensor, it lets the ECU fire the correct injector and coil at the right moment and adjust valve timing for smooth idle, good torque, and tidy fuel economy. If that signal goes missing or gets messy, the ECU often disables cam phasing and throws a Check Engine light to protect the engine.

Routine servicing doesn’t usually include scheduled replacement of camshaft sensors. They’re solid-state and designed to last. What does help is keeping the area clean, checking the harness for rub-through, and making sure any oil weeps from rocker covers or timing covers are sorted so oil doesn’t wick into connectors. During major services, a quick visual of both sensors (right- and left-hand cylinder banks) and their plugs is smart insurance.

Replacement is a straightforward remove-and-refit job for a competent home mechanic or technician. Disconnect the battery negative, unplug the sensor, remove the small retaining bolt, and ease the sensor out. A light smear of clean engine oil on the new O-ring helps it seat without tearing. Refit, tighten to the factory torque specification, reconnect, clear any DTCs, and let the ECU settle at idle. Using a high-quality OEM-equivalent sensor avoids nuisance faults and odd running behaviour.

• Common signs of trouble: hard starting, rough idle, poor performance, higher fuel use, AVCS-related codes, and a glowing Check Engine lamp.
• If faults appear after other engine work, double-check timing work, connector seating, and earth points before condemning the sensor.
• If a sensor fails intermittently with heat, testing when hot can save time and guesswork.

For owners clocking up plenty of kilometres, treating the cam sensors and their wiring with a bit of respect during filter and plug changes will pay off in long, drama-free running.

How many camshaft sensors does a 2019 Subaru Impreza have?

The FB20-powered 2019 Impreza uses two camshaft position sensors, typically one on each cylinder bank (RH and LH). They work alongside the crankshaft sensor to manage sequential injection, ignition timing, and AVCS cam phasing. Each is mounted near the front/top of its respective cylinder head for easy access.

What fault codes point to a camshaft sensor issue on this model?

Common OBD-II codes include P0340/P0341 (camshaft position sensor circuit/range-performance) and P0345/P0346 (for the second bank). Drivers may also notice rough idle, sluggish response, or the ECU disabling AVCS. Always check wiring, connectors, and oil contamination before replacing the sensor.

Is it safe to drive with a faulty camshaft sensor?

It may run, but performance can drop, fuel use can rise, and stalling or hard starting can occur. Prolonged driving risks catalyst damage if misfires creep in. Best practice is to diagnose promptly and repair, if the engine stalls or won’t restart when hot, arrange transport rather than press on.