Home› Belts and Cooling > Radiators, Coolers and Related Components› URO 8W0121405L Engine Coolant Reservoir
URO 8W0121405L Engine Coolant ReservoirOE Quality 60-Day Returns
Part #: 8W0121405L

URO 8W0121405L Engine Coolant Reservoir

15 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$92.43Free Shipping
Free ShippingNo Cost to Continental U.S.
Free Returns*Wrong fit? No cost
60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Audi, A4, A4 Quattro, A5 Quattro, and A5 Sportback
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST
Not what you need? See all Engine Coolant Reservoir options

Engine Coolant Reservoir for Audi A4 and A5

Replace a cracked or leaking coolant expansion tank with this URO engine coolant reservoir, part number 8W0121405L. It is a direct-fit replacement for select 2017-2020 Audi A4, Audi A4 Quattro, Audi A5 Quattro, and Audi A5 Sportback applications.

Key Features

  • Engine coolant reservoir for European vehicle cooling systems
  • URO Parts replacement component built to meet or exceed OEM specifications
  • Direct replacement for part number 8W0121405L
  • Cross-references Audi OE numbers 8W0 121 405E and 8W0 121 405F
  • Fits 2017-2020 Audi A4 and Audi A4 Quattro, plus 2017-2020 Audi A5 Quattro and 2018-2020 Audi A5 Sportback

Detailed Description

This URO coolant reservoir is made for drivers and technicians servicing modern Audi cooling systems. It supports proper coolant expansion and recovery in the reservoir assembly, helping maintain stable system operation on 2017-2020 Audi A4, Audi A4 Quattro, Audi A5 Quattro, and Audi A5 Sportback models. Part number 8W0121405L is a practical OE-style replacement when the original tank is damaged, aged, or no longer sealing correctly.

This part cross-references Audi OE numbers 8W0 121 405E and 8W0 121 405F for the same application.

What It Helps Fix

  • Coolant loss from a cracked reservoir
  • Visible coolant seepage around the expansion tank
  • Low coolant warnings caused by tank failure
  • Heat-related plastic deterioration in the cooling system
  • Service issues on Audi A4, Audi A4 Quattro, Audi A5 Quattro, and Audi A5 Sportback models

Installation Notes and Tips

Verify the OE part number and vehicle application before installation. Inspect the reservoir cap, hoses, and surrounding cooling components for wear or contamination while the system is open. After installation, refill and bleed the cooling system according to Audi service procedures to remove trapped air.

Quality Assurance

URO Parts manufactures replacement components for European vehicles that are built to meet or exceed OEM specifications. The brand also offers upgraded URO Premium components for problem-prone OE designs, along with a lifetime warranty on URO Premium products.

This part fits 15 vehicles. Search below:

YearMakeModelPositionNotes
2020AudiA4N/A
2020AudiA4 QuattroN/A
2020AudiA5 QuattroN/A
2020AudiA5 SportbackN/A
2019AudiA4N/A
2019AudiA4 QuattroN/A
2019AudiA5 QuattroN/A
2019AudiA5 SportbackN/A
2018AudiA4N/A
2018AudiA4 QuattroN/A
2018AudiA5 QuattroN/A
2018AudiA5 SportbackN/A
2017AudiA4N/A
2017AudiA4 QuattroN/A
2017AudiA5 QuattroN/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

1834008W0 121 405E8W0 121 405F8W0 121 405L8W0121405LURO-015199

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

Related Articles