Parts for your 2016 Subaru Impreza-Drive belt tensioner

2016 Subaru Impreza drive belt tensioner

Yes, the 2016 Subaru Impreza uses a drive belt tensioner. Subaru’s 2016 Impreza Factory Service Manual for the FB20 engine details an automatic tensioner for the accessory (serpentine/alternator) belt, while the air-conditioning belt is a separate stretch-fit design with no tensioner. This setup is also reflected in Subaru’s parts catalogue and major aftermarket catalogues (Gates, Dayco), which list a dedicated automatic belt tensioner for this model.

On the Impreza, the drive belt tensioner keeps the alternator belt at the right tension automatically, compensating for belt wear and temperature changes. That consistency stops belt slip, avoids annoying squeals on cold start, and reduces load on bearings in the alternator and other driven components. The built-in damper smooths belt flutter and vibration, protecting the belt and pulleys over long kilometres.

As part of regular servicing, it’s smart to check the tensioner at the same time the belt is inspected. Look and listen with the engine idling: the arm should track smoothly with minimal bounce, and the pulley should spin quietly with no wobble. Any rattling, chirping, visible misalignment, or oil seepage from the tensioner body is a sign it’s due for replacement. Many technicians replace the tensioner with the second belt change or when symptoms appear, rather than at a strict interval.

When replacing the belt or tensioner, use a quality OEM-equivalent part and a new belt. Relieve tension with the correct spanner on the tensioner hex, follow the under-bonnet belt routing diagram, and torque fasteners to the Subaru spec. Spin the idler and tensioner pulleys by hand while you’re there, any roughness means they should go too. After refit, start the engine and watch for smooth tracking and quiet operation.

Note for this model: the A/C belt is a separate stretch-fit belt without a tensioner. If that belt needs replacing, use the proper installer tool and do not lever it on with a screwdriver. It’s not reusable once removed.

• Common signs of a failing tensioner: cold-start squeal, belt slap or flutter, shiny/glazed belt, pulley wobble, or a jittery tensioner arm.
• Benefits of a healthy tensioner: quieter running, longer belt life, stable alternator output, and less risk of being stranded.

FAQs

Does a 2016 Subaru Impreza actually have a belt tensioner?
Yes. The FB20 engine uses an automatic tensioner for the accessory/alternator belt. The separate A/C belt is stretch-fit and has no tensioner. This layout is documented in the Subaru Factory Service Manual and reflected in OE and aftermarket parts listings.

When should the drive belt tensioner be replaced?
There’s no fixed kilometre-only rule. Replace it if the pulley is noisy, the arm jitters, there’s oil leakage, or the belt shows uneven wear or persistent squeal. Many workshops fit a new tensioner at the second belt replacement to avoid repeat labour and roadside dramas.

Is it safe to keep driving with a noisy or weak tensioner?
Not recommended. A slipping or poorly controlled belt can overheat and fail, which can knock out your alternator and leave you with a flat battery. Sort it promptly to keep the Impreza reliable.