Parts for your 2015 Subaru Impreza-Drive belt

2015 Subaru Impreza drive-belt — what it does, when to replace it, and how to look after it

Yes, a drive-belt is fitted to the 2015 Subaru Impreza with the FB20 2.0-litre boxer engine. Technical sources including the Subaru Factory Service Manual for the 2015MY Impreza (FB series), Subaru’s scheduled maintenance information, and Australian/NZ application data from major belt manufacturers (e.g., Gates and Dayco) confirm the car uses a single multi-rib “serpentine” accessory drive-belt. It spins the alternator and air-conditioning compressor. The car uses electric power steering (so there’s no power-steering pump belt), and its timing is by chain inside the engine, not by an external timing belt.

In day-to-day driving, the drive-belt’s job is simple but critical: keep the battery charged via the alternator and power the A/C when you want cold air. If the belt slips or fails, you could see a battery charge warning, dim lights, or no A/C. Because the FB20’s water pump is driven internally, a broken accessory belt usually won’t cause instant overheating, but it’ll leave the alternator offline and can strand the vehicle once the battery runs flat.

Good servicing for an Aussie or Kiwi–delivered 2015 Impreza means checking the belt at regular intervals. A practical approach that aligns with common workshop practice and manufacturer guidance is:

• Inspect every 10,000–15,000 km or 6–12 months, and before long trips.
• Replace around 100,000–150,000 km or 6–8 years, sooner if there’s any sign of wear.

What to look for:

• Noises: chirps or squeals at cold start, or under load with A/C on.
• Condition: cracked ribs, fraying, glazing/shiny surfaces, missing rib chunks, or contamination (oil/coolant).
• Hardware: check the automatic tensioner and idler pulleys for smooth, quiet operation and proper alignment.

When replacing, use the correct 6‑rib belt spec for the FB20 engine. Fitment is typically straightforward with a serpentine-belt tool or spanner to unload the spring tensioner, route per the under-bonnet diagram, then re-check alignment. If the old belt shows abnormal wear, inspect and, if needed, replace the tensioner or idlers, a fresh belt on tired pulleys won’t stay quiet for long. After installation, run the engine with A/C on and lights loaded to confirm quiet, slip-free operation.

Sticking to these basics keeps charging performance spot-on and helps avoid surprise electrical issues on a chilly morning run or a hot arvo commute.

Popular questions

Does the 2015 Impreza have a timing belt or a chain?

It has a timing chain. The “drive-belt” on this model refers to the external serpentine belt that drives the alternator and A/C compressor, not the internal timing drive. That’s why a failed accessory belt won’t usually cause immediate engine timing problems.

How often should the drive-belt be replaced on a 2015 Impreza?

Inspect it every 10,000–15,000 km or 6–12 months. Many EPDM belts last 100,000–150,000 km, but age, heat, and contamination matter. Replace sooner if there’s cracking, glazing, rib chunking, persistent squeal, or if the tensioner/idlers are worn.

What noises mean the belt needs attention?

Brief chirps at cold start can point to minor slip or a tired tensioner. Continuous squeal, especially with A/C on, suggests glazing, misalignment, or a failing pulley. Any rumble or grind from idlers/tensioner means those bearings need replacing along with the belt.