No, a Cobb Accessport cannot be actively used on more than one car at the same time. It is "married" to a single vehicle's ECU (Engine Control Unit) when you install a tune. To use it on a different car, you must first "unmarry" it by uninstalling the tune and returning the original vehicle to its factory settings. This process locks the Accessport to the new vehicle. The primary limitation is that you cannot tune two cars simultaneously with one device; it's a one-to-one relationship when active.
The concept of "marrying" is a core part of how the Accessport protects both the user and Cobb's intellectual property. When married, the device stores a unique checksum from your car's ECU, preventing its use on another vehicle until it's unmarried. This ensures that the specific tune files, which are designed for particular engine and transmission combinations, are not misapplied, which could cause serious engine damage.
The ability to unmarry and switch the Accessport makes it a transferable device if you sell your car or buy a new one. However, frequent switching is not recommended due to the potential for wear on the car's OBD-II port from repeated plugging and unplugging.
| Consideration | Details |
|---|
| Vehicle Compatibility | An Accessport is model-specific (e.g., AP3-SUB-004 for 2015-2021 WRX). It cannot be used on incompatible models. |
| Unmarrying Process | Essential before selling the car or Accessport. If the device is still married, the new owner cannot use it. |
| Simultaneous Use | Impossible. One Accessport = one actively tuned vehicle. |
| Used Market Purchase | Must verify the device is fully unmarried; a married used Accessport is a useless brick. |
| Typical Uninstall Time | The process to unmarry and return to stock takes approximately 10-15 minutes. |
If you own multiple compatible vehicles, the only practical solution is to purchase a separate Accessport for each car you wish to tune.
