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Genuine 4G0 121 081 CR Coolant Breather Line Vent Tube OEM Audi

Manufacturer

Picture for manufacturer Genuine

Part Number

4G0 121 081 CR
8 reviews
Sale Price

$119.12

In Stock (7)

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Usually delivered within 2 days

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Product Details

The Genuine 4G0 121 081 CR is an OEM factory-original coolant breather line (also known as a vent tube or coolant vent pipe) sourced directly from the Volkswagen Audi Group (VAG). This front-positioned main supply vent tube is a critical component of the engine cooling system, responsible for channeling coolant vapors and maintaining proper pressure balance within the coolant circuit to prevent vapor lock and overheating.

Key Features:

  • 100% genuine OEM Audi/VAG part — guaranteed factory fit and finish
  • Front-mounted main supply coolant breather line (vent tube)
  • Designed for 4.0L engine applications (non-RS7 fitment)
  • Constructed from durable, heat-resistant materials engineered to withstand continuous coolant system pressures and temperatures
  • Direct OEM replacement — no modifications required for installation
  • Replaces worn, cracked, or leaking coolant vent lines that can cause cooling system inefficiency or coolant loss

Over time, coolant breather lines can become brittle, cracked, or develop leaks due to prolonged heat exposure and pressure cycling. Replacing a faulty vent tube with this genuine OEM part restores proper cooling system function and prevents potential engine overheating. Also commonly referred to as a coolant vent pipe, coolant overflow hose, or reservoir breather tube. OEM Part Number: 4G0-121-081-CR.

Great

Very pleased with my order! Would buy from them again! Thank you!

Thanks!

A dealership broke one of the parts of a rim I have on a car and needed a part in a pinch! Price was great and shipping was incredibly fast! Really happy with the selection and listing such a specific part, other sites just listed part numbers without pictures so THmotorsports made it easy to trust.

Showed up a day ahead of schedule, nice, thanks!

Simple order process. Arrived amazingly fast. Thanks

This company is super fast to get you your order! I ordered online and figured it would be at least a couple days or so until my order would even get processed. I think they overnighted it to me! The package showed up undamaged and sealed. Unfortunately, I may have to return the product as I am thinking I would like the spikes shorter but that is no fault of Thmotorsports. Hopefully their customer service is as superior as their ordering and shipping. At this point I would definitely shop there again and recommend them.

Package was shipped out very fast. The packaging and materials were very good.

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