Take a clear photo of the complete label on your Audi’s original ECU before shopping. Copy the full Audi reference, including the final letter or letters, and the supplier reference if shown. Record the engine code and have your installer check the hardware, software and immobilizer requirements for your vehicle. Confirm any proposed replacement number in the parts information for your vehicle.
Check what comes with the listing
An ECU-only listing supplies the engine computer. An ECU with a key may be a two-piece listing. A larger set can have a separate immobilizer or body module and a cluster, depending on the exact product. Read the list of included parts and compare each label that matters to the job. Ask the installer to confirm which components the job requires and whether the key in the listing is matched.
For example, the Audi Q5 8R2907115 listing shows a standalone ECU. The Audi Q5 8R0907559F listing identifies an ECU and key only. These are examples of two sale formats for different applications. Use the Audi collection and search by the number on your own unit.