The most common symptoms of a faulty/incorrectly installed motor are:

Clunking or Grinding noise when driving
Wheels are going the wrong way
One Wheel is going forward & the other backwards
The item is turning on and full voltage but not driving

Depending on the symptoms above, here are a few ways you can troubleshoot a faulty/Incorrectly installed motor/s

First thing to check is that both wires are soldered on in the motor, as sometimes these may snap off.
If the wires are connected, then, the next thing is to listen, if the motor is making a grinding or clunking noise, the motor is faulty and will require replacing.
A good way to test if one of the motors is faulty is to disconnect one motor at a time and try to drive the car with just one motor connected. This way we can isolate the faulty motor/s.
If one wheel is going forward and the other wheel going backwards, the manufacturers have connected the wires on the motor the wrong way around and this can easily be fixed by swapping the wires in the plug and this will resolve the issue.
If both motors are spinning the wrong way around this means the left motor has been put on the right and the right on the left, please swap them around and the issue will be resolved.

Here's a video showing how to troubleshoot wheels spinning in opposite/wrong direction

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