If you have an AFM Disabler installed on your vehicle, there are a few ways to tell if it is working properly. One way is to simply listen to your engine. If you hear any unusual noises or sounds, it is possible that the AFM Disabler is not functioning correctly. Another way to tell if your AFM Disabler is working properly is to check your fuel economy. If you notice a decrease in fuel economy, it could be an indication that the AFM Disabler is not working as intended. Lastly, if you experience any drivability issues such as hesitation or stalling, it is likely that the AFM Disabler is not operating correctly.