Radiator Cap – Audi A4, A6, A8 (OEM 8E0121321) (Topran)

This high-quality Topran Radiator Cap (109345) is a direct replacement for OEM part number 8E0121321, designed to maintain optimal pressure within the cooling system and prevent overheating in select Audi models. Also referred to as coolant expansion tank cap or cooling system pressure cap.

Key Features:
- Direct replacement for OE part number 8E0121321  
- Aftermarket reference number 109345  
- Maintains correct cooling system pressure and prevents coolant loss  
- High-quality seal to ensure reliable performance  
- Manufactured to meet or exceed OEM specifications  

Compatible With:
- Audi A6 C5 Saloon (4B2) – 1.8 T, 1.9 TDI, 2.0, 2.4, 2.5 TDI, 2.7 BiTurbo, 2.8, 3.0, 4.2, S6 4.2 (1997–2005)  
- Audi A6 C5 Avant (4B5) – 1.8 T, 1.9 TDI, 2.4, 2.5 TDI, 2.7 BiTurbo, 3.0, 4.2, S6 4.2 (1997–2005)  
- Audi A4 B6 Saloon (8E2) – 1.6, 1.8 T, 1.9 TDI, 2.0, 2.4, 3.0 (2000–2004)  
- Audi A4 B6 Avant (8E5) – 1.8 T, 1.9 TDI, 2.0, 2.4, 3.0 (2001–2004)  
- Audi A8 D3 (4E2, 4E8) – 3.0 TDI, 3.7 V8, 4.0 TDI, 4.2 FSI, 4.2 TDI, 6.0 W12, S8 5.2 V10 (2002–2010)  
- Audi A6 C6 Saloon (4F2) – 2.0 TDI, 2.7 TDI, 3.0 TDI, 2.8 FSI, 3.2 FSI, 3.0 TFSI, 4.2 FSI, S6 5.2 V10 (2004–2011)  
- Audi A6 C6 Avant (4F5) – 2.0 TDI, 2.7 TDI, 3.0 TDI, 3.2 FSI, 3.0 TFSI, 4.2 FSI, S6 Avant 5.2 V10 (2005–2011)  

Compatible Engine Codes:
- AWT, AVF, AWX, AKE, BAU, BDH, BDG, BPP, BNG, ASN, BBJ, BDV, ALT, BFM, BSG, BDX, BPP, BXA, CCAA, CCWA, BNG, BVJ, BHT, BFM, BVZ, BXA, BVG, BXA, BHT  

Year Range:
- 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011  

This is an aftermarket replacement part, not a genuine Audi component.