Radiator – 8E0 121 251 AJ
Radiator for the Audi A4 (B6/B7) platform, OE number 8E0 121 251 AJ. Main group 121 sub-group 251 identifies this as a radiator. Revision index AJ. Cooling capacity and mounting differ between engine variants on the same platform — confirm against your engine code before ordering.
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Technical specifications
| Part Number | 8E0 121 251 AJ |
| SKU | AUD-8E0121251AJ |
| Brand | |
| Category | Radiators |
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Customer reviews
Verified feedback from Audi owners and independent workshops.
3.5
6 reviews
Adrian Novotny
July 23, 2026
Straight swap
Fitted to my 2014 Q3 8U. I pressure tested it to 1.4 bar before fitting and it held without a drop. Front end off, old one out, this one in over a long Saturday. Result is no more creeping temperature when towing. Good value against the dealer price.
Aisha Lindqvist
April 17, 2026
Fins bent in transit
Replacement for my 2012 A7 4G 1.4 TFSI. Several fins arrived flattened because the box had almost no internal padding. Front end off, old one out, this one in over a long Saturday. Disappointing for the price.
Sven Adeyemi
December 1, 2025
Fits, but budget a new fan shroud
Second one of these I have bought, this time for the A6 C7. All the mounting points and hose stubs lined up without any persuasion. The end tanks are properly crimped with clean seams all the way round. On balance the coolant level has not moved in four months. Good part, minor niggles.
Daniel Lindqvist
October 31, 2025
Temps back to normal
Ordered this for my Q5 8R after the original gave up at 107k. The end tanks are properly crimped with clean seams all the way round. The transmission cooler lines threaded straight in with no adapters. Result is the gauge sits dead centre now even in traffic on a hot day. Will be back for the other side.
Hugo Silva
August 26, 2025
Seeped from the end tank
Replacement for my 2022 Q8 4M 2.5 TFSI. A weep appeared at the end tank seam after a few heat cycles. I flushed the system properly and refilled with the correct G13 before bleeding. Would not order the same one again.
Yara Vance
April 28, 2025
Solved my overheating
Bought for a 2021 Q8 4M. I flushed the system properly and refilled with the correct G13 before bleeding. The core is thicker than the unit it replaced and the fin density is noticeably higher. Result is the gauge sits dead centre now even in traffic on a hot day.