Radiator – 4K0 121 251 P
Radiator for the Audi A6 / A7 (C8) platform, OE number 4K0 121 251 P. Main group 121 sub-group 251 identifies this as a radiator. Revision index P. 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 | 4K0 121 251 P |
| SKU | AUD-4K0121251P |
| Brand | |
| Category | Radiators |
Shipping & returns
Standard shipping
3–5 business days. Free on orders over $150.
Express delivery
Order before 2 PM for next business day delivery.
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Return unused parts within 30 days for a full refund.
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Customer reviews
Verified feedback from Audi owners and independent workshops.
4.7
3 reviews
Zara Vance
April 13, 2026
Straight swap
Went on my A3 8P 2.5 TFSI at 67k miles. Front end off, old one out, this one in over a long Saturday. I pressure tested it to 1.4 bar before fitting and it held without a drop. Result is the coolant level has not moved in four months. Delivery was quick too.
Tobias Lindqvist
February 2, 2026
Better core than the original
Ordered this for my A7 4G after the original gave up at 42k. 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. Would order again without hesitation.
Claire Novak
May 27, 2025
Holds pressure beautifully
Ordered this for my A4 B8 after the original gave up at 122k. I flushed the system properly and refilled with the correct G13 before bleeding. The plastic feels substantial rather than the brittle stuff that cracks at the neck. Result is intake temps dropped noticeably on a long motorway pull. Cannot fault it.