Audi VW Engine Coolant Bypass Hose - Genuine Audi VW 06K121049A

Product Information

An engine coolant bypass hose is a small but critical component in the cooling system that allows coolant to circulate within the engine when the thermostat is closed. This circulation helps prevent hot spots, reduces the risk of overheating during engine warm-up, and ensures smoother temperature regulation. A properly functioning bypass hose maintains consistent coolant flow and protects the engine from thermal stress.

• Coolant leaks visible around the hose or under the vehicle.
• Engine overheating, especially during warm-up, due to restricted coolant flow.
• Cracks, swelling, or soft spots on the hose, indicating deterioration or impending failure.

About Genuine VW Audi

The Volkswagen Group, also known as “VAG”, consists of Volkswagen, Audi, Lamborghini, Bentley, Bugatti, Porsche, Ducati, MAN, Scania, SEAT, and Skoda. The original parts used by VAG to build your car are available as replacement parts under the “Genuine VAG” brand. Manufactured under the direction of VAG, expect excellent quality and a premium price since these parts are available exclusively through the VAG Dealership network.

You may not realize this, but the parts that make up your VAG are not necessarily manufactured by VAG. No cause for concern, as VAG designs the part, hires a manufacturer, and ensures its quality to you. In fact, many of these manufacturers have been making parts for VAG for decades. In our industry these manufacturers are called OEM (Original Equipment Manufacturers), and these are often brands you recognize, including Lemforder, ZF, Sachs, Bosch, Valeo, Zimmermann, Siemens VDO, Corteco, and more. Don’t be surprised to open that Genuine VAG parts box and find an OEM branded part inside, simply with the addition of a VAG logo.

Be sure to keep an eye out for OE tags on our product pages to quickly identify parts coming direct from OE manufacturers. That extra bit of insight could save you some serious money while shopping! Refer to our OE Academy for further information regarding the OE/OEM tags throughout the site.