Parts for your 2017 Subaru Legacy-Starter motor

2017 Subaru Legacy starter motor: what it does and how to keep it sweet

Technical sources confirm the 2017 Subaru Legacy (BN/BS series) is fitted with a conventional 12‑volt starter motor on both the 2.5‑litre FB25 and 3.6‑litre EZ36 engines. Key references include: Subaru Legacy/Outback 2015–2019 Factory Service Manual, Electrical section – Starter System, Subaru Global Service Information (STIS) – Starter System diagnostics, and Subaru Genuine Parts catalogues listing a complete starter assembly for the 2017 Legacy powertrains. That means the starter-motor is absolutely relevant for servicing and troubleshooting on this model.

On this Legacy, the starter-motor’s job is simple but crucial: spin the flat-four or flat-six fast enough for fuel and spark to take over. An electric motor and solenoid push the pinion into the flywheel ring gear, crank the engine, then pull back once it fires. With a CVT on most trims, start-inhibit logic and the neutral safety circuit keep cranking safe and tidy.

For reliable starts, battery health and clean earths matter just as much as the starter itself. Many “no crank” dramas trace back to a weak battery, tired terminals, or dodgy ground straps. Sensible service habits for this Legacy include battery load tests during routine servicing, cleaning and tightening the terminals, and a quick visual of the main starter cable and earth points under the bonnet. Because the boxer exhaust runs close by, heat-soak can be a thing after a hot shutdown, good heat shielding and the correct spec starter help.

Signs the starter’s on the way out include a single click with no crank, slow or laboured cranking, a high‑pitched grind on engagement, or intermittent no‑start when everything else seems fine. A tech will usually confirm with a voltage‑drop test at the starter circuit, then bench‑test the unit off the car.

When replacement’s needed, choosing a quality OEM or reputable reman starter pays off—cheap units can struggle with heat and duty cycles. Typical workshop steps are battery negative off, intake ducting or covers out of the way, unplug the solenoid connector, then remove the mounting bolts from the bellhousing. While in there, it’s smart to inspect the ring gear teeth and address any oil leaks that might drip onto the starter.

• Good habits: avoid holding the key or start button after the engine fires, keep the battery in top nick, listen for new noises after any clutch or transmission work, and if the car has idle stop‑start in a given market, ensure the starter meets the higher cycle rating.

Popular questions about 2017 Subaru Legacy starter motors

Where is the starter-motor on a 2017 Subaru Legacy?
It’s mounted to the transmission bellhousing at the rear of the engine, under the intake area. From above, it sits near the centreline of the engine bay, access typically involves removing intake ducting or covers for room to work.

What are common symptoms of a failing starter on this model?
Common tell‑tales are a single click with no crank, slow cranking even with a healthy battery, intermittent no‑start that improves with a tap on the housing, or a grinding noise as the pinion engages the ring gear. Proper diagnosis should include a battery/load test and starter circuit voltage‑drop check before condemning the motor.

How long do they last and what might replacement cost in AU/NZ?
With good battery care, many last 150,000–250,000 km. Costs vary by engine and brand—expect roughly AUD/NZD $400–$1,100 fitted at a typical workshop, depending on parts choice and local labour rates.