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Check Engine

Your modpack's check engine light. Crash, missing mod, broken recipe or "Invalid player data" kick? It tells you what broke and how to fix it, in plain English. Undo bad updates, find the faulty mod, back up and rescue your worlds. Never touches gameplay.
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Check Engine 0.16.0 (NeoForge 1.21.1)

File namecheckengine-neoforge-1.21.1-0.16.0.jar
Uploader
UanmeUanme
Uploaded
Oct 19, 2026
Downloads
15
Size
750.4 KB
Mod Loaders
NeoForge
File ID
9256365
Type
R
Release
Supported game versions
  • 1.21.1

Curse Maven Snippet

NeoForge

implementation "curse.maven:check-engine-1730396:9256365"

Learn more about Curse Maven

What's new

Check Engine 0.16.0

New: recipe check (type /checkengine scan)
- Finds recipe clashes: two recipes that take the same items but make different things, so only one ever works
- Finds recipes nobody can craft because a slot asks for an empty tag
- Lists quest items and ingredients that nothing gives (often mob drops, worth a look)
- Mods' built-in extras for mods you don't have are now one short note, not warnings
- Fast, even in packs with 46,000 recipes

New: known crashes
- Crash Doctor knows crashes other people already solved and shows their fix first
- Daily list updates are off unless you turn them on

New: Fix it on the can't-join screen
- When your mods don't match the server, press Fix it: extra mods get switched off and the server's versions downloaded when possible
- Nothing is deleted, and Undo puts everything back

Also
- The 26.1 version now works on Minecraft 26.2 too
- Crash Doctor shows up even when another mod covers the title screen

This mod has no related projects