Parts for your 2018 Subaru Exiga-Crank angle sensor

2018 Subaru Exiga crank angle sensor: what it does and how to look after it

Based on Subaru factory service information for the FB-series 2.5‑litre boxer used in the 2015–2018 Exiga/Crossover 7, the vehicle is equipped with a crankshaft position sensor—commonly called a crank angle sensor. Subaru’s Service Manual (Engine Diagnostics: FB25) details the “Crankshaft Position Sensor” circuit and related fault codes (P0335–P0339), and earlier EJ-series turbo and non‑turbo boxers also specify a CKP sensor. These technical references confirm the 2018 Subaru Exiga definitely uses a crank angle sensor, it’s essential for engine management.

The crank angle sensor feeds the ECU precise information about crankshaft speed and position. Using a toothed reluctor wheel, it times fuel injection and spark, manages variable valve timing, and helps with smooth starting. If it drops out, the ECU loses sync—cue hard starting, misfires, sudden stalling, limp behaviour or a no‑start with the MIL lit.

There’s no scheduled replacement interval for the Exiga’s crank angle sensor. It’s a solid-state Hall or magnetic pickup designed to last the life of the vehicle. During routine servicing, a technician may simply check for stored DTCs, inspect the sensor connector and harness for oil ingress or corrosion, and ensure the loom isn’t chafing on brackets. The air gap is fixed by design, so there’s nothing to “adjust.”

Replacement is straightforward when diagnostics confirm a fault: verify power, ground and signal with a scope, rule out damaged wiring, and only then fit a quality OEM‑spec sensor. After installation, clear codes and perform a road test, the ECU will relearn crank/cam sync on its own. If cold starts are rough after battery disconnection or replacement, an idle relearn drive cycle may help.

Common signs it’s time to investigate the crank angle sensor on a 2018 Exiga include:

• Intermittent stall at idle or while cruising, especially hot.
• Extended cranking or a complete no‑start with P0335‑type codes.
• Tachometer dropping to zero briefly while the engine is still spinning.

Tips that save time and dollars:

• Check engine and gearbox earths—poor grounds can mimic sensor faults.
• Inspect connectors for oil wicking from nearby seals, clean and reseal if needed.
• Use dielectric grease on pins sparingly to keep moisture at bay.
• A weak battery or slow cranking in winter can throw red herrings, test the battery first.

Popular questions about the 2018 Subaru Exiga crank angle sensor

Does a failing crank angle sensor always trigger a fault code?
Not always. Intermittent dropouts can occur without an immediate MIL. A scan of pending codes and live data, or an oscilloscope capture of the CKP waveform, is the surest way to catch it misbehaving.

Can the Exiga be driven with a bad crank angle sensor?
It’s risky. Some failures cause random stalling or a no‑start once hot. If it’s throwing P0335‑style codes or cutting out, it’s best to sort it before it leaves someone stranded.

Is any programming needed after replacing the sensor?
No special coding is required. Clear the codes, start the engine, and let the ECU relearn. If idle is unstable after battery disconnection, a short mixed‑drive cycle usually tidies it up.