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MTA:SA anti-cheat code

MTA:SA anti-cheat code AC#18

MTA's anti-cheat lists this number under altered game files.

How to fix it

  1. Use the official client and clean game files

    Install MTA from multitheftauto.com and keep GTA unmodified. Trainers, injected DLLs and patched game files are exactly what these checks look for.

  2. Use a clean GTA: San Andreas

    MTA needs an unmodified GTA installation. If mods, an ASI loader or a replaced gta_sa.exe are in the game folder, reinstall GTA into a fresh folder and let MTA use that copy.

  3. Read the whole message, then the official page

    The number names a detection category, not a program on your computer. MTA's anti-cheat guide lists what each category covers, and the full message is what tells you which case you are in.

  4. If you were banned, appeal where it was issued

    A server ban is appealed on that server. An MTA global ban is appealed through MTA's own process. Keep the full message: it names who issued it. On CIT, appeals are posted on the forum, not in game: a ban, limit ban, fullmute ban or a mute over 3 days goes to the Bans Issued board (cit.gg/index.php?board=626.0), other punishments to the Punishment Appeals board (cit.gg/index.php?board=600.0). If you cannot use the forum, ask someone to post it for you.

Still not fixed? Copy the whole message, not only the code, and check your log in the Fix tool. It is read on your own computer.

About this code

AC is one of MTA's three anti-cheat prefixes. The number names a published detection category. MTA's own guide says a detection does not prove intent, and it does not list every detector. MTA's own documentation gives AC#18 as Altered game files.

Where this comes from

Read on 5 September 2026 and written in our own words here.