Parts for your 2020 Subaru Outback-Drive belt

2020 Subaru Outback drive-belt: what it does and when to replace it

Based on Subaru’s technical literature—including the 2020 Outback service manual (FB25/FA24 engine families, “V‑ribbed belt/Drive Belt” section) and the factory maintenance schedule—the 2020 Subaru Outback is fitted with an external accessory drive belt (often called a serpentine or V‑ribbed belt). These same sources note the engines use timing chains for cam drive, so there’s no timing belt on this model. The accessory belt’s job is separate from the timing chain and remains relevant to regular servicing.

On the 2020 Outback, the drive belt turns key ancillaries under the bonnet—most notably the alternator and the air‑conditioning compressor. Power steering is electric, so there’s no hydraulic pump on the belt, and the water pump is driven internally by the timing chain. Even so, the belt is essential: if it slips or fails, the alternator won’t charge, the battery warning lamp may illuminate, electrical systems can run low on voltage, and the A/C will go warm.

Subaru’s service guidance has the belt inspected at routine service intervals (commonly every 12 months/12,500–15,000 km in Australia and New Zealand). There isn’t a fixed kilometre-based replacement interval in the factory schedule, instead, it’s condition‑based. Workshops look for cracking across the ribs, glazing or a shiny surface, chunking, fraying edges, rubber dust around the pulleys, and noises such as chirps or squeals—especially on cold starts or with the A/C engaged. The automatic tensioner should also be checked for smooth operation and proper alignment.

As a practical rule of thumb, many owners choose preventive replacement somewhere around 100,000–150,000 km or 6–8 years, earlier if there are any signs of wear or noise. When fitting a new belt, correct routing (follow the under‑bonnet diagram), a quick check of all pulleys, and confirming the tensioner isn’t sticking will keep things quiet and reliable. Given the relatively modest cost of the belt and the fact the job is typically swift for a technician, it’s an easy win to keep the Outback’s electrics healthy and the cabin cool.

• Symptoms to watch: belt squeal or chirp, visible cracks or glazing, battery warning lamp, dimming lights, or A/C losing its cool at idle.
• Service tip: inspect the belt and tensioner at every scheduled service, replace the belt on condition or proactively before a big trip.

Popular questions

Does the 2020 Subaru Outback have a timing belt or a chain?
The 2020 Outback uses a timing chain (FB25 2.5‑litre and FA24 2.4‑litre turbo). The external belt in question is the accessory drive belt, which runs the alternator and A/C, not the camshafts.

How often should the drive belt be replaced on a 2020 Outback?
Subaru specifies inspection at regular services rather than a strict kilometre target. Many workshops recommend replacing on condition or preventively around 100,000–150,000 km or 6–8 years, sooner if there’s noise or visible wear.

What are the signs the belt or tensioner needs attention?
Look and listen for chirps or squeals on start‑up, glazing or cracks in the ribs, frayed edges, rubber dust, or a wandering belt. Electrical warnings (battery light) and weak A/C performance can also point to belt slip.