Replacing a Forester's 12-volt battery
Most battery jobs on a Forester are simple. The part that matters is the test first. A mechanic checks the battery and the charging system, because a new battery in a car that isn't charging it will soon be flat again.
The 12-volt cover in that handbook is shorter than the car's 5-year warranty, so on a newer Forester, check the date of first registration before you pay. Our guide to how long car batteries last covers the warning signs.
Forester hybrids have two batteries
The current Forester went on sale here on 28 May 2025 with a 2.5-litre petrol or a hybrid, whose battery is 1.1 kWh. Subaru's handbook for hybrids carries a warning that the high-voltage parts can be dangerous, so the hybrid side is work for a mechanic trained on it.
Subaru also asks hybrid owners to drive the car once a month for at least 30 minutes to keep the high-voltage battery charged. A yearly hybrid health check is built into the schedule. If you're buying a used hybrid, CarsGuide suggests a check of the pack before you sign.
Subaru Forester timing belt or chain?
| Cam drive | What to do | |
|---|---|---|
| SG (from 2002), 2.5-litre | Rubber timing belt, interference engine | Replace on schedule. In Australia, Subaru moved Series II (MY06) cars from 100,000 km to 125,000 km |
| SK (2018 to 2025) | Timing chain, made to last the engine's life | No scheduled replacement. Keep the oil fresh |
| Other years | Depends on the engine | Check the engine code with the mechanic |
Why a late timing belt is a real risk
An interference engine is one where the valves and pistons share space at different moments. If the timing belt (the rubber belt keeping them in step) breaks or stretches, the pistons can hit the valves, and that's an engine repair, not a belt change. On an older 2.5-litre Forester with no record of a belt change, treat it as due.
On chain engines the risk is different. CarsGuide says the engine has lots of small oilways that can clog if the oil isn't kept fresh and clean, so on-time oil changes matter more than any belt.
Servicing and recalls
Subaru's interval for Foresters from Model Year 2019 is 12 months or 12,500 kilometres, whichever comes first. Towing, dusty or rough roads, coastal living and lots of short trips call for more frequent servicing.
Forester models from 2013 to 2015 were part of a 2019 recall of brake light switches, which could stop the brake lights working. CarsGuide's used review of later cars also lists recall work on rear stabiliser bar bolts and fuel pumps. A VIN check settles which apply to yours.
Tell us it's a Forester, the year and what it's doing. A local mechanic who specialises in your car.
What we'd do with a Forester
For a slow start, have the battery and charging tested before buying anything, and ask for one that matches the manual. If it's an older 2.5-litre with no belt receipt, book the belt in ahead of anything optional. And on a hybrid, take it for that monthly half-hour drive if it mostly sits.