It’s a pretty simple part, really. Its main job is to guide the serpentine belt – that long, winding belt that runs all your engine accessories. It doesn’t drive anything itself, it just changes the belt’s direction and maintains proper tension. Think of it like a little turning point for the belt, keeping it moving smoothly around the engine. It also takes some of the stress off other pulleys and components. It's part of your engine’s accessory drive system. That system powers things like your alternator (charges the battery), power steering pump, and air conditioning compressor. So, the deflection pulley isn't directly making those things work, but it’s absolutely essential for keeping the whole system running. It works along with the tensioner pulley to keep the belt tight and prevent slippage. Well, if this pulley fails, the belt can jump off track or get damaged, and that can cause a whole cascade of problems. You’ll notice if it’s failing usually with a squealing or chirping sound, especially when you first start the car or when you put a load on the accessories – like turning the steering wheel hard or turning on the AC. If it gets really bad, you could lose power steering, your battery won’t charge, and your AC will stop working. It’s a relatively inexpensive part to replace, and a lot cheaper than dealing with the consequences of a broken belt or damaged accessories. You can find a good selection of them at places like Fixparts Online. Replacing it is generally straightforward, but if you aren’t comfortable working on cars, it’s best to let a mechanic handle it. Invest in reliability: Deflection Pulley (MPN 1987945812) includes a 12-month warranty!

About Bosch

With a heritage of innovation, Bosch provides dependable and efficient automotive components that set industry standards.

Why Choose Bosch?

• Bosch parts are known for lasting a long time, so you won't have to replace them often. • They're made with high-quality materials and tested thoroughly, meaning they perform reliably. • Bosch offers a wide range of parts, so you're likely to find what you need for almost any vehicle. • Mechanics and drivers around the world trust Bosch – it’s a name you can depend on. Bosch – trusted quality, available at FixParts Online!