Mods (Terrain and cars) not working on steam release.

I have a new problem. When i download cars from official beamng, the car spawns, but engine doesnt turn on, or work. Everything else works fine.. What's wrong?

 

The mod is probably broken and you should contact te mod creator. Or try swapping out engine en transmission parts

 

I downloaded beamng on a flash drive at the end of May, and today I downloaded it on to my pc, yet mods haven't worked since the first time I downloaded it, someone please help me!

 

How old are the mods? And where are your mods located?

 

They're new, credible mods like the crd monster truck and the fr17 and they're in the mods folder
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By the way I still have it on my flash drive