The Motor and Battery Swap challenge can look deceptively simple, but a lot of players still trip over it. The game does not always count a random EV upgrade, so you end up spending time and money for nothing. If you are low on FH6 Credits, it makes sense to check the cheaper swap first, since the stamp only cares that you use the right conversion in the right menu.

Getting to the Right Menu

Start with a car that actually supports the swap. Then head into your garage, open the Cars tab, and go to Upgrades and Tuning. From there, choose Custom Upgrade, then move into Body Kits and Conversions. The option you want is Motor and Battery Swap. That part matters. A regular upgrade path will not do it, even if the car is electric. A lot of people miss this because the menu names sound close enough to confuse you on the first try.

Which Cars Work

Not every EV gives you the same options, and that is where the frustration usually starts. Some of the easier cars to use are the BMW iX xDrive50, the Wuling Hongguang Mini EV, and the Honda e. These models tend to show the swap cleanly, so you are not fighting the interface just to make progress. If your current EV does not show the conversion at all, that is usually the car, not the challenge. In other words, do not keep digging through the same menu expecting a different result.

Installing the Swap

Once you are in the Motor and Battery Swap section, pick one of the available options and buy it. The cheapest one is usually fine if you only want the stamp. The more expensive version may give better performance, but the challenge does not care which one you choose. After the install, back out of the garage and return to free roam. That final step is easy to miss. The notification normally appears once the game sees you back in the open world, so if you stay parked in the menu, nothing happens and it feels broken.

Final Thoughts

If the stamp still does not pop, double-check the basics before spending more time on it. Make sure the car is one of the supported EVs, make sure you used the actual swap option, and make sure you left the garage afterward. That is usually enough to fix it. It is a small objective, sure, but it teaches you how the upgrade system is put together and why some cars behave differently from others. Keeping a few extra Forza Horizon 6 Credits set aside also helps, because then a quick challenge like this does not eat into the money you need for cars you actually want.