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Coolant Tank Cap AMCP-18123-VW007 OE Ref 5Q0121321

Key Specification:
  • COOLANT TUBES: 4
  • Fabrication Number: AMCP-18123-VW007
  • OEM Reference number: 4N0121403H
  • PURPOSE GROUP: Coolant Tank
  • Supplementary Info: EXPANSION TANK CAP
Sale
£ 37
£ 30.83 excl. VAT
In Stock
SKU:AMCP-18123-VW007
BrandAftermarket
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COOLANT TUBES
4
Fabrication Number
AMCP-18123-VW007
OEM Reference number
4N0121403H
PURPOSE GROUP
Coolant Tank
Supplementary Info
EXPANSION TANK CAP
Supplementary Info
TANKS
Supplementary Info
AUDI A3 - Q2 - TT - SEAT ATECA - LEON - SKODA FABIA III - KAROQ - KO
Supplementary Info
DIAQ - OCTAVIA III - SUPERB III - YETI - VW GOLF VII - PASSAT B8 - TO
Supplementary Info
UAREG - UP

Coolant Tank Cap OE Ref 5Q0121321

Keeps your AUDI, SEAT, SKODA, VW running the way it should — this Aftermarket part restores the original function of a worn or failed Coolant Tank Cap OE Ref 5Q0121321, built to OEM reference 4N0121403H rather than a generic approximation.

  • EXPANSION TANK CAPTANKSAUDI A3 - Q2 - TT - SEAT ATECA - LEON - SKODA FABIA III - KAROQ - KODIAQ - OCTAVIA III - SUPERB III - YETI - VW GOLF VII - PASSAT B8 - TOUAREG - UP

Aftermarket identifies it as AMCP-18123-VW007. Match that against OEM 4N0121403H or your old part before fitting, particularly if your vehicle's had any running changes across its production years.

Fitment Notes

Confirmed for selected AUDI, SEAT, SKODA, VW vehicles. Use the vehicle registration lookup tool if you're not certain, or browse Engine Cooling System for other options.

Reference number(s) comparable with the original spare part number
AUDI 3C0121321 AUDI 5Q0121321 SEAT 3C0121321 SEAT 5Q0121321 VW 3C0121321 VW 5Q0121321 VAG 3C0121321 VAG 5Q0121321 SKODA (SVW) 3C0121321 SKODA (SVW) 5Q0121321
OE reference number(s) comparable with the original spare part number
  1. Berry
    12 Nov, 2025
    elderly car so really pleased that the part could be supplied :-) Correct part arrived swiftly - excellent - thank you
  2. Edward & Susan
    20 OCT, 2025
    These guys were real helpful when I was looking for an EGR valve. Great communications and fast delivery, the valve did exactly as It was meant to do and it was a lot cheaper than everywhere else I looked. I'll be using eAuto Parts again. Top banana.
  3. Charlie
    27 AUG, 2025
    eAuto Parts made me happy because it only took 2 minutes to order the part and at a very good price, also very quick delivery, will definitely deal with them again.
  4. Adam Taylor
    12 May, 2025
    Quick enquiry response, easy buying and quick delivery. Quality of goods was good and fitted with no problem (Suzuki bonnet hinges.) recommended.
  5. Helena Garcia
    2 January, 2025
    The correct part was rapidly identified and located, and was despatched promply to my chosen repairer in time for the work to be done on schedule. Very pleased with the service and will be using eAuto Parts again.