This thing precisely measures out fuel additives – things like cetane improvers, fuel stabilizers, or even diesel exhaust fluid – and injects them into the fuel stream. It doesn’t make the fuel, it just adds a very specific, controlled amount of something to the fuel. It's all about getting the right mix, consistently. Newer systems often use it for things like DEF injection, but older diesels might use it for stuff like pour point depressants, keeping the fuel from gelling up in cold weather. Think of it like a little helper for your fuel system. It sits inline with the fuel line, usually pretty close to the fuel tank, and is controlled by the engine’s computer. The computer tells the dosing module how much additive to inject, based on things like engine temperature, fuel temperature, and even how hard you’re pushing the engine. It's a small part, but a vital one for specific fuel needs. Honestly, if it fails, you’ll notice if your vehicle requires these additives. Without it functioning properly, you can run into issues like poor fuel economy, rough idling, or even engine damage, depending on what it’s dosing. It's there to protect your fuel system and keep things running smoothly. If you need to replace one, Fixparts Online usually has a good selection. It's one of those parts you don’t think about until it’s causing a problem, but it acts like a shield, preventing bigger headaches down the road. Customer-approved reliability: Dosing Module (MPN 0444021021) 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 being reliable and lasting a long time, saving you money in the long run. • They work well right out of the box, so you can get back on the road quickly and easily. • Bosch invests a lot in research and development, meaning they’re always improving their parts with the latest technology. • Whether you drive a newer car or an older one, Bosch has a wide range of parts to fit your vehicle. FixParts Online – Your Trusted Source for Quality Bosch Auto Parts.