Parts for your 2018 Subaru Outback-Camshaft sensor

2018 Subaru Outback camshaft sensor: fitment, purpose and service tips

Yes, the 2018 Subaru Outback uses camshaft position sensors. Technical sources including the Subaru Factory Service Manual (2018 Outback/Legacy, Engine Diagnostics for FB25 2.5L and EZ36 3.6L), Subaru’s Tech Information System, and aftermarket repair databases (Haynes, Mitchell1/Alldata) document two camshaft position sensors on this model—one per cylinder bank—with diagnostics for DTCs such as P0340 (Bank 1) and P0345 (Bank 2). Those manuals also show the sensors mounted at the rear of each cylinder head, working alongside the crankshaft sensor and AVCS (variable valve timing) system.

The camshaft sensor tells the ECU exactly where each cam is, so the Outback can fire injectors and spark at the right moment and fine‑tune valve timing. Without accurate cam timing feedback, it can be slow to start, run rough, or drop into limp mode.

Typical clues the sensor or its circuit needs attention include:

• Long crank, intermittent stalling, lumpy idle, or flat spots
• Check Engine Light with codes like P0340/P0345
• Poor fuel economy and reduced performance

It isn’t a scheduled service item, but a few habits help it live a long life:

• Keep oil fresh and the correct viscosity, AVCS relies on clean oil
• Avoid blasting the engine bay with water, moisture in connectors causes dramas
• During major services, eyeball the sensor plugs and loom for oil seepage or chafing

Replacement is straightforward if diagnostics confirm the fault. Under the bonnet, each sensor sits at the back of a cylinder head:

1. Disconnect the battery negative
2. Unclip the connector, remove the retaining bolt, and withdraw the sensor
3. Fit a new O‑ring, lightly oil it, and install the new sensor
4. Torque to factory spec, reconnect, clear codes, and road test

Pro tips: Use quality OE or reputable aftermarket parts, cheap sensors can cause ghost faults. If both banks flag together, rule out wiring, the crank sensor, or timing issues before throwing parts at it. No special calibration is usually needed—once fitted, the ECU will relearn, just clear the codes and check live data. Many last the life of the vehicle, but if symptoms pop up around higher kilometres, testing with a proper scan tool and a scope (if available) beats guessing every day of the week.

Popular questions about 2018 Subaru Outback camshaft sensors

How many camshaft sensors does a 2018 Outback have?
It has two—one for each cylinder bank on both the 2.5L and 3.6L engines. They’re mounted at the rear of the cylinder heads and provide the ECU with precise cam phase information for AVCS control.

Do camshaft sensors need coding or calibration after replacement?
No special coding is typically required. Fit the sensor, clear the fault codes, and let the ECU relearn. If idle is a bit off initially, a short drive cycle and a few key‑on/key‑off events usually settle it.

Can a faulty camshaft sensor damage the engine?
It won’t usually cause immediate mechanical damage, but prolonged misfires or rich running can stress the catalytic converter. If the light’s on and it’s running poorly, sort it promptly to avoid downstream repairs.