Expansion Tank, coolant4G0 121 403 AC

Audi, CUPRA, and Volkswagen OE number, as listed in aftermarket supplier catalogues. Compare listings for this exact number, then confirm the part number and vehicle fitment before ordering.

Lowest price

€6.95

plus €14.72 shipping to Germany, on Ovoko

Compare 97 listings

Compare offers

What each marketplace’s search lists for this number, lowest price first, Ovoko last. Listings can include other parts that name it.

AUTODOC

1 listing

New

Checked 2026-05-15 13:53 UTCAftermarket parts whose suppliers list this OE number, not the original part.

€31.06Cheapest listing: MAHLE CRT 60 000S+ €6.95 shipping to GermanyView on AUTODOC

OvokoLowest price

96 listings

Used

Checked 2026-10-24 04:56 UTC

€6.95 – €68.18Cheapest listing: + €14.72 shipping to Germanyestimated delivery in 4–6 daysView on Ovoko

We may earn a commission through partner links. How we stay useful

Aftermarket part numbers

Supplier articles whose catalogue lists 4G0 121 403 AC. Check the supplier’s own restrictions before ordering.

BIRTH: 80145
FEBI: 171863
HELLA: 8MA 366 365-161
MAHLE: CRT 60 000S
METZGER AUTOTEILE: 2140185
MEYLE: 100 223 0016
VAICO: V10-8562
VEMA: 163085Fitting position: 1st front axle

Vehicle fitment

Engine code and production dates decide fitment. Model name and year alone don’t.

120 vehicles in 16 model series, inferred

Aftermarket parts that list 4G0 121 403 AC fit these vehicles according to their supplier catalogues. That does not prove 4G0 121 403 AC itself fits every one: check the engine code, production dates and the supplier’s restrictions on the model series’ vehicle pages.

Audi

16 model series · 120 vehicles

Audi model series inferred from aftermarket parts
Model series	Production	Engine codes	HSN / TSN
A6 (4G) 2009–15 vehicles	11/2010 – 09/2018	CAEB, CAED, CDNB, CGLC, CGLD, CGLE, CHJA, CHVA, CLAB, CMGB, CNHA, CSUD, CSUE, CTCB, CTCC, CYGA, CYNB, CYPA, CZJA, CZVB, CZVD, DDCB, DDDA	0588 / AOD, AQY, AQZ, ARB, ARU, ATL, AUU, AYT, BBH, BBI, BBL, BBM, BCM
A6 (4G) Allroad quattro10 vehicles	01/2012 – 09/2018	CDUD, CGQB, CGWD, CKVC, CLAA, CREC, CRTD, CRTE, CRTF, CVUA, CZVA, CZVC, CZVF	0588 / ARO, ARP, ATI, ATZ, AVB, AVG, BBT, BBX, BBY, BBZ, BCD, BCJ, BES, BHF
A6 (4G) Avant13 vehicles	05/2011 – 09/2018	CDNB, CGLC, CGLD, CGLE, CHVA, CLAB, CMGB, CNHA, CSUD, CSUE, CTCB, CTCC, CYGA, CYNB, CYPA, CZJA, CZVB, CZVD, DDCA, DDCB, DDDA	0588 / AQS, ARK, ARL, ART, ARW, ARX, AST, ASU, AUT, AUW, AYU, BAB, BBR, BBS, BBV, BBW, BCF, BCG, BCK, BCN, BCO, BCP
A6 (4G) Avant quattro17 vehicles	05/2011 – 09/2018	CDUC, CDUD, CGQB, CGWB, CGWD, CHVA, CKVB, CKVC, CLAA, CNHA, CREC, CRTD, CRTE, CRTF, CVPA, CVUA, CVUB, CYPA, CYPB, CZVA, CZVC, DDDA	0588 / ARM, ARN, ARO, ARP, ATI, ATZ, AVB, BBG, BBT, BBX, BBY, BBZ, BCA, BCD, BCJ, BED, BEF, BEL, BEO, BEU, BHE
A6 (4G) quattro21 vehicles	11/2010 – 12/2018	CAEB, CAED, CCAA, CDUC, CDUD, CGQB, CGWB, CGWD, CGXB, CHVA, CKVB, CKVC, CLAA, CNHA, CPNB, CREC, CREH, CRTD, CRTE, CRTF, CTUA, CVPA, CVUA, CVUB, CYNB, CYPA, CYPB, CZVA, CZVC, DDDA	0588 / ARA, ARC, ARD, ARE, ATH, AVW, BBJ, BBN, BBO, BBP, BBQ, BCL, BEC, BEE, BEP
A7 (4G) Sportback 2010–201810 vehicles	11/2010 – 05/2018	CHVA, CLAB, CLXB, CTCC, CYGA, CYPA, CZVB, CZVC, CZVD, CZVE	0588 / AQE, AQT, AQX, ARF, BAW, BBC, BCC, BCF, BCG, BCP, BEH, BEX, BHG
A7 (4G) Sportback quattro19 vehicles	07/2010 – 12/2018	CDUC, CDUD, CGQB, CGWB, CGWD, CGXB, CHMA, CHVA, CKVB, CKVC, CLAA, CNYA, CPNB, CREC, CRTD, CRTE, CRTF, CTCB, CTTA, CTUA, CVPA, CVUA, CVUB, CYNB, CYPA, CYPB, CZVA, CZVC, CZVD, CZVE, CZVF	0588 / AQF, AQG, AQH, AQU, AQV, AQW, ARS, ARY, ATJ, ATZ, AVX, BAU, BAX, BAY, BAZ, BBB, BBD, BBE, BBF, BBG, BCB, BCD, BCE, BEG, BEQ, BEU, BGH, BHE, BHF
A8 (4H) 2011–20151 vehicle	09/2012 – 11/2015	CHJA	0588 / ATM
A8 (4H) Long quattro1 vehicle	01/2017 – 01/2018	CYPA	Not listed
A8 (4H) quattro1 vehicle	09/2016 – 01/2018	CYPA	0588 / BKF
RS6 (4G) Avant quattro3 vehicles	01/2013 – 09/2018	CRDB, CWUB, CWUC	1860 / AAH, AAI 7967 / AAY, ABI
RS7 (4G) Sportback quattro2 vehicles	05/2013 – 05/2018	CRDB, CWUB, CWUC	1860 / AAJ, AAN 7967 / AAZ, ABJ
S6 (4G) Avant quattro2 vehicles	04/2012 – 09/2018	CEUC, CTGE	0588 / AVC, AVY, BBU, BCH
S6 (4G) quattro2 vehicles	04/2012 – 09/2018	CEUC, CTGE	0588 / AVD, BBK
S7 (4G) quattro1 vehicle	01/2013 – 03/2015	CEUC	0588 / AVE, AVY
S7 (4G) Sportback quattro2 vehicles	02/2012 – 05/2018	CEUC, CTGE	0588 / AVE, AVY, BAV, BCH