Is your check engine light on, or are you noticing a small coolant leak or pressure issue? A faulty radiator cap on your coolant expansion tank could be the culprit. This HAOTOM replacement cap is a direct-fit, high-quality part designed to restore proper sealing and pressure in your cooling system. It's compatible with a ton of late-model Audis (from around 2015-2023), including the A4, A4L, A5, A6, A7, A8L, S4, S5, Q5, Q5L, Q7, Q8, RS4, and RS5. It also fits the Porsche Cayenne and Cayenne Coupe from 2018-2023. These caps can crack or wear out over time due to heat and fatigue. Replacing it is a relatively simple and inexpensive fix that can prevent overheating and more serious engine damage. This cap is manufactured to strict OEM specifications for a perfect fit and reliable performance. It comes with a 1-year warranty and is thoroughly inspected before shipping. VERY IMPORTANT: Please double-check your specific vehicle year, model, and engine to ensure compatibility. You can often find the OEM part number on your old cap or ask your dealer. Don't let a tiny part cause a big problem!
