Both of them interact each other, so please by this TCU/ECU only according to these part numbers. Also this part isn't plug and play - you will must have to programm it to the car or change software. So this part will be able to install only in specialised service/some ethusiast or audi dealer center. So if you will send back item - items must be original from my listing.Please remember it is an used car part and don't expect it to be like brand new. We send product within 3 days. Please note our couriers do not work during the weekends so we dispatch Monday-Friday only. The item "AUDI A4 B8 8K A5 8T Multitronic Automatic Gearbox Control ECU Module 0AW927156H" is in sale since Thursday, June 13, 2019. This item is in the category "Vehicle Parts & Accessories\Car Parts\Electrical Components\ECUs/Computers". The seller is "rm-shop8" and is located in Malta. This item can be shipped worldwide.