Forza Horizon 5 mods without a ban: the offline-only playbook

Forza Horizon 5 has no mod loader and no official tool support, so "modding" it means running standalone utilities against a game that actively watches for them. This guide covers what is safe to run, how to set it up without risking your account, and where the line sits between sanctioned customisation and a ban.

First, understand what you are working with

Forza Horizon 5 is built on Playground Games' ForzaTech engine and ships with a built-in anti-cheat. There is no Workshop, no Nexus-style loader, and nothing you "install" into a mods folder. The open-source tools attach to the running game process instead. That design choice drives every safety rule below: the anti-cheat is far less concerned with files on disk than with manipulated online sessions.

There are really two worlds here. One is sanctioned and runs inside the game: liveries, tunes, blueprints, and EventLab creations, all shared through the in-game search with zero risk. The other is the external tooling world, which is where bans happen if you are careless.

Set up Forza Mods AIO

The most-used open-source tool is Forza Mods AIO, a free C# project from the Forza Mods community that covers both Forza Horizon 4 and 5. It is a single executable, not an installer.

Download the latest release from the Forza Mods AIO repository. Take the build from the official Forza Mods GitHub organisation, not a re-upload, since trainers are a common malware vector.
Unblock the executable. Windows SmartScreen will flag an unsigned tool. If you trust the source, right-click the file, open Properties, and tick Unblock.
Launch Forza Horizon 5 and put it in offline mode before doing anything else (see below).
Run the AIO executable as administrator so it can attach to the game process.
Use the in-tool menu for teleport, car unlocks, credits, and visual options.

Switch to offline mode every single time

This is the rule that protects your account. Forza Horizon 5's online "Horizon Life" shared world and ranked progression are where the anti-cheat reacts to manipulated values. Modify credits or unlock cars while connected and you risk a wipe or a ban from Playground Games and Microsoft.

To go offline, set the game's online and HUD options to solo before launching tools, or block the game in your firewall for the session. Treat anything done with a tool attached as offline-only, including FOV changes and model swaps.

The smaller tools worth knowing

SaveTools: reads and edits Forza save containers. Use it to fix a corrupted save or move progress, and always keep a copy of the original file first.
Car-Table: unlocks the full car list in Forza Horizon 5 without grinding wheelspins.
Fov-Menu: pushes the field of view past the in-game slider limits, useful for triple-monitor and cockpit setups.
ForzaModelTool: replaces car parts and wheels, for visual builds the in-game customiser will not allow.

All four live in the same Forza Mods GitHub organisation and are catalogued where they are published openly.

Common gotchas

A game update broke the tool. Title updates shift memory offsets, so AIO features can stop working the day a patch lands. Check the repo's issues before assuming your install is broken; a fix usually follows the patch.
Cheat Engine crashes the launch. The game detects Cheat Engine at startup even when it is idle in the background. Close it fully, do not just minimise it.
SmartScreen or antivirus quarantines the tool. Memory-editing tools trip heuristic detection by nature. Only whitelist a build you got from the official repo, and read the source if you are unsure.
You got a warning after online use. That is the anti-cheat doing its job. Stop using tools online; warnings escalate to bans.
Liveries are not mods. If all you want is a custom look, the in-game design search and EventLab do it safely and need none of the above.

Where to go next

For the wider picture of how this scene is shaped and what OpenMods catalogues for it, read the Forza Horizon 5 game overview. If you are curious whether any of this carries over to the new Japan-set entry, see Forza Horizon 6.