Radiator, engine cooling4B0 121 251 AF

Audi, CUPRA, Škoda, 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.

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Checked 2026-10-08 19:50 UTC

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Aftermarket part numbers

Supplier articles whose catalogue lists 4B0 121 251 AF. Check the supplier’s own restrictions before ordering. A fitment condition under a part number is one its supplier names for at least one of the vehicles the part is listed for, not for all of them: a vehicle’s page shows which apply to it.

BOSCH: 1986ED1313Fitment conditions:For vehicles with automatic transmission For vehicles with automatic transmission, 5-speed Installation period: 04/2001, 05/2004 For vehicles with air conditioner
+1 moreShow fewer
HELLA: 8MK 366 302-761Radiator type: Brazed cooling fins Cooling Fin Material: Aluminium Water Tank Material (radiator): Plastic Core Length: 632 mm Core Width: 398 mm Core Depth: 26 mm Inlet Diameter: 32.5 mm Outlet Diameter: 32.5 mm Supplementary Article/Supplementary Info: with gaskets/seals Supplementary Article/Supplementary Info 2: without expansion tank
+7 moreShow fewer
Fitment conditions:New Part Transmission Type: 5-Speed Automatic Transmission, Automatic Transmission Construction Year to: 01.2003, 05.2003, 05.2005
MAGNETI MARELLI: 350213185500Core Length: 635 mm Core Depth: 23 mm Core Width: 396 mm Radiator type: Mechanically jointed cooling fins
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Fitment conditions:Engine Code: AAH, ABC, ACK, ADP, AFB, AFC, AGA, AGB, AGE, AHA, AHL, AJG, AJK, AKN, ALF, ALG, AML, AMM, AMX, ANA, APC, APR, APS, APZ, AQD, ARE, ARJ, ARM, ATQ, ATX, AYM, AZA, AZB, BAU, BBG, BDG, BDH, BDV, BES Transmission Type: 4-Speed Automatic Transmission, 5-Speed Automatic Transmission, 5-Speed Manual Transmission, 6-Speed Manual Transmission, CVT automatic transmission (stepless) Construction Year to: 05.1995, 10.1996, 01.1999, 10.2000, 05.2001, 05.2004 Construction Year from: 08.1994, 10.1997, 02.1999 Vehicle Equipment: for vehicles with air conditioning (manually controlled) Vehicle Identification Number (VIN) from: 2-020 001
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MAHLE: CR 648 000SRadiator type: Mechanically jointed cooling fins Heating/Cooling: for vehicles with combined radiator/ oil cooler Core Length: 630 mm Core Width: 397 mm Core Depth: 36 mm Water Tank Material (radiator): Plastic Supplementary Article/Supplementary Info 2: with quick couplers Supplementary Article/Supplementary Info 2: with screw Packaging width: 18.5 cm Net Weight: 4,285 g Packaging height: 51.2 cm Packaging length: 80.6 cm Weight: 5,000 g
+10 moreShow fewer
Fitment conditions:Transmission Type: 5-Speed Automatic Transmission, Automatic Transmission Construction Year from: 04.1997, 01.1998
STELLOX: 10-25139-SXCore Length: 632 mm Core Width: 399 mm Core Depth: 32 mm Transmission Type: Automatic Transmission Vehicle Equipment: for vehicles with air conditioning Vehicle Equipment: for vehicles without air conditioning
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Fitment conditions:Construction Year to: 01.1999, 04.2001, 05.2004
VEMO: V15-60-5047Core Width: 398 mm Core Depth: 32 mm Core Length: 632 mm Material: Aluminium, Plastic
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ZentParts: Z20080Transmission Type: Automatic Transmission Core Length: 632 mm Core Width: 399 mm Core Depth: 32 mm Vehicle Equipment: for vehicles with air conditioning
+2 moreShow fewer

Vehicle fitment

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

126 vehicles in 25 model series, inferred

Aftermarket parts that list 4B0 121 251 AF fit these vehicles according to their supplier catalogues. That does not prove 4B0 121 251 AF itself fits every one: check the engine code, production dates and the supplier’s restrictions on the model series’ vehicle pages.

Audi

18 model series · 90 vehicles

Audi model series inferred from aftermarket parts
Model series	Production	Engine codes	HSN / TSN
A4 (8D) 1994–20048 vehicles	11/1994 – 12/2001	AAH, ABC, ACK, ACZ, AFB, AFC, AGA, AHA, AJG, AKN, ALF, ALG, AML, AMM, AMX, APR, APS, APZ, AQD, ARJ, ATQ, ATX	0588 / 595, 597, 633, 661, 665, 696
A4 (8D) Avant7 vehicles	11/1994 – 09/2001	ABC, ACK, ADP, AFB, AGA, AHA, AHL, AJG, AKN, ALF, ALG, AML, AMM, ANA, APR, APS, APZ, AQD, ARJ, ARM, ATX	0588 / 618, 623, 634, 662, 666, 698
A4 (8D) Avant quattro6 vehicles	07/1995 – 09/2001	ABC, ACK, ADR, AFB, AGA, AHA, AJG, AKN, ALF, ALG, AML, AMX, APR, APS, APT, APZ, AQD, ARG, ARJ, ATQ	0588 / 620, 624, 636, 664, 668, 699
A4 (8D) quattro7 vehicles	11/1994 – 08/2001	AAH, ABC, ACK, AFB, AFC, AGA, AHA, AJG, AKN, ALF, ALG, AML, AMX, APR, APS, APZ, AQD, ARJ, ATQ, ATX	0588 / 596, 598, 635, 663, 667, 697
A4 (8E2) 2000–20091 vehicle	09/2001 – 12/2004	BDV	0588 / 784
A6 (4A) 1994–19982 vehicles	06/1994 – 12/1998	AAH, ACK, AFC	0588 / 507, 614
A6 (4A) Avant1 vehicle	10/1995 – 10/1997	ACK	0588 / 615
A6 (4A) Avant quattro2 vehicles	06/1994 – 12/1998	AAH, ACK, AFC	0588 / 528, 617
A6 (4A) quattro1 vehicle	01/1996 – 04/1997	ACK	0588 / 616
A6 (4B) 1997–201213 vehicles	04/1997 – 01/2005	ACK, AFB, AGA, AGE, AJG, AJK, AKE, AKN, ALF, ALG, ALW, AML, AMM, AMX, APC, APR, APS, APZ, AQD, ARJ, ARN, ASM, ATQ, ATX, AYM, BAU, BCZ, BDG, BDH, BDV, BFC	0588 / 648, 653, 655, 659, 669, 695, 729, 759, 768, 799
A6 (4B) Allroad quattro3 vehicles1 of them: some versions only	05/2000 – 08/2005	AKE, ARE, BAU, BDH, BES	0588 / 732, 736, 737
A6 (4B) Avant12 vehicles	04/1997 – 01/2005	ACK, AFB, AGA, AGE, AJG, AJK, AKN, ALF, ALG, ALW, AML, AMM, AMX, APC, APR, APS, APZ, AQD, ARJ, ARN, ASM, ATX, AYM, BCZ, BDG, BDV, BFC	0588 / 679, 680, 684, 686, 690, 694, 761, 770, 800
A6 (4B) Avant quattro11 vehicles1 of them: some versions only	04/1997 – 01/2005	ACK, AFB, AGA, AJG, AJK, AKE, AKN, ALF, ALG, AML, AMX, APC, APR, APS, APZ, AQD, ARE, ARJ, ATQ, ATX, AZA, BAU, BDH, BDV, BES	0588 / 681, 685, 687, 691, 692, 732, 736, 737, 771
A6 (4B) quattro11 vehicles	04/1997 – 01/2005	ACK, AFB, AGA, AJG, AJK, AKE, AKN, ALF, ALG, AML, AMX, APC, APR, APS, APZ, AQD, ARE, ARJ, ATQ, ATX, AZA, BAU, BDH, BDV, BES	0588 / 649, 654, 656, 660, 693, 730, 767, 769
Coupé (8B) quattro2 vehicles	08/1991 – 12/1996	AAH, ABC	0588 / 523, 566
RS4 (8D) Avant quattro1 vehicle	06/2000 – 09/2001	ASJ, AZR	7967 / 307
S4 (8D) Avant quattro1 vehicle	08/1997 – 09/2001	AGB, AZB	0588 / 646
S4 (8D) quattro1 vehicle	10/1997 – 09/2001	AGB, AZB	0588 / 645

Škoda

1 model series · 4 vehicles

Škoda model series inferred from aftermarket parts
Model series	Production	Engine codes	HSN / TSN
Superb I4 vehicles	12/2001 – 04/2008	AMX, AYM, BBG, BDG	8004 / 380, 381, 394, AAC, AAH

Volkswagen

6 model series · 32 vehicles

Volkswagen model series inferred from aftermarket parts
Model series	Production	Engine codes	HSN / TSN
Passat 4 (3B) 1996–20058 vehicles	10/1996 – 11/2005	ACK, AFB, AFN, AGE, AHA, AKN, ALT, AMX, APR, AQD, ATQ, ATX, AVG, AWM, BBG, BDG	0603 / 344, 348, 473, 608, 671, 716
Passat 4 4motion (3B)5 vehicles	12/1998 – 05/2005	ACK, AFB, AHA, AKN, ALG, AMX, APR, AQD, ATQ, BAU, BBG, BDH, BDN, BDP	0603 / 352, 495, 609, 623, 642, 650, 672, 704
Passat 4 syncro (3B)2 vehicles	04/1997 – 08/2000	ACK, AHA, ALG, APR, AQD	0603 / 352
Passat 4 Variant (3B)10 vehicles1 of them: some versions only	10/1996 – 05/2005	ACK, AEB, AFB, AFN, AGE, AHA, AKN, ALT, AMX, ANB, APR, APU, AQD, ATQ, ATW, ATX, AUG, AVF, AVG, AWT, AWX, AZX, BBG, BDG	0603 / 361, 363, 365, 474, 606, 614, 616, 620, 670, 717
Passat 4 Variant 4motion (3B)5 vehicles	06/1997 – 12/2005	ACK, AFB, AHA, AKN, ALG, AMX, APR, AQD, ATQ, ATX, BAU, BBG, BDH, BDN, BDP	0603 / 367, 496, 607, 622, 651, 703
Passat 4 Variant syncro (3B)2 vehicles	06/1997 – 08/2000	ACK, AHA, ALG, APR, AQD	0603 / 367