Which Mustang have you got?
S550, first series. Deliveries here started in 2016, with a 2.3-litre turbo petrol or a 5.0-litre V8, a six-speed manual or a six-speed automatic.
S550, second series. Arrived in June 2018. The automatic became a ten-speed, and the GT manual gained a twin-disc clutch and a dual-mass flywheel.
S650. The current shape, with the same two engine sizes. CarExpert counted 866 registered here by November 2024, so these cars are mostly still young.
Ford Mustang battery: what else it can be
Test first. A local mechanic should check the battery, the alternator's charging and any draw on the battery with the car parked. Mustangs that sit in a garage between weekends can go flat for that reason alone, so tell the mechanic how often it's driven.
A manual that won't crank. A Ford bulletin from August 2016 says the clutch pedal position switch on 2015 to 2016 manuals can get damaged, and then the engine won't crank. The fix is a new switch and bracket, not a battery.
Battery cable on early V8s. A March 2017 recall covered 2015 to 2016 V8s, where the battery cable loom could touch the exhaust manifold and short out, with a fire risk. Check it's been done.
S650 wiring. In September 2026 CarsGuide reported 7,724 Mustangs built 2023 to 2026 recalled, because an engine wiring harness can break from vibration and cut engine power. Headlamps and wipers may fail too. Another recall covers a Body Control Module (the computer that runs lights and other electrics) that water can get into.
More on the basics in car battery replacement.
Common Ford Mustang problems
These come from recalls, bulletins and owner reports. They're things to check, not a verdict on the car.
Brake fluid warning light. On 2019 to 2023 cars it might not come on with low fluid. Cars from 2021 to 2023 were recalled a second time in February 2026 because of an incorrect software update, so a stamp from the first recall may not be enough.
Fuel pump. CarsGuide reported 2,039 Mustangs built 2021 to 2022 recalled over a pump impeller that can cause a loss of power.
Driveline vibration. A bulletin on 2015 to 2017 cars describes vibration at 70-100 km/h through the floor, seat or wheel, with a rumble or hum. Balancing is the first step.
Early EcoBoost. Stored codes on 2015 to 2017 2.3-litre cars were fixed by a new purge valve and reprogramming.
S650 gearbox and dash. A 2025 recall covers a valve body fault that may stop the car reversing or let it creep, and two recalls cover the digital instrument cluster.
Ford Mustang service: what's due
carsales lists the 2020 Mustang at 15,000 km or 12 months. Your book has the final word, and a car that sits should still get its yearly service, because the 12 months counts as much as the kilometres.
Tell the mechanic which engine and gearbox you've got, and whether anything's been modified. Superchargers, exhausts and tunes change what they should look at, and one recall is specific to cars with supercharger kits.
CarExpert lists a five-year, unlimited-kilometre warranty on the 2023 car. If a qualified independent mechanic services a Mustang under warranty to Ford's schedule and specifications, that does not by itself void the new car warranty. Keep the invoices.
Tell us the year, the engine and the job. A local mechanic who specialises in your car.
Where we'd start with a Mustang
Run the VIN through vehiclerecalls.gov.au first, because this car has a long recall list and some work has had to be repeated. If it's a battery complaint, ask for a battery, charging and parked-draw test, and for a manual, ask the mechanic to look at the clutch pedal switch too. If the car mostly sits, ask the mechanic whether a battery maintainer suits it.