Before come straight conclusion about the reason of behind Vsc off with check engine light simultaneously then what should have to do at that time?
You need to be very calm and cool and don’t try anything blunder by opening the hood and do it yourself unless you are very sure of what is happening with your vehicle and you can fix that issue by yourself, most probably not very often even though an expert can’t do anything unless you have tools and required replacement parts for that problem.

Buy a simple good quality OBD2 device or cheap code reader and carry all the time in your car as a one of essential safety kit while driving on road, it can assist you at the spot about what issue arises for that problem, sometimes OBD2 device alone fix your car temporarily or permanently by removing error and allow you to reach at a mechanic expert. Other common errors in Toyota.
Evaporative Emission Control System Leak Detected (no purge flow or large leak)
Evaporative Emission Control System Incorrect Purge Flow
Engine Control System Malfunction
This one is the Most Common problem arises in Toyota,Find out how to identify and troubleshoot are in detail.
Catalyst converter
O2 Sensor
The P0455, P0441 codes point to a leak in the emissions system. Technically it could be in the filler neck, or the line to the charcoal canister, but the majority of the time it’s simply a leaky gas cap. Either an improperly installed cap or a worn out one.
Tighten the gas cap: Tight the cap until you hear sound, do it 3 to 4 times and check your engine light.
Clean and grease the gas cap’s seal: The rubber seal on the cap looked pretty dry and worn, cleaned it and applied a bit of grease to soften it up.
Purchase an aftermarket gas cap: Get the Oem Toyota gas cap from Toyota dealership and replace with the faulty one.
You can also do by replacing the seal of faulty cap with the new one and try it.
Conclusion
If that failed to remove these errors then there are other issues in the engine that requires expert mechanic.
The C1201 code is the one that tells the vehicle to turn on the check engine light and disable the traction and VSC. Basically, this one is in charge of letting you know there’s a problem. Fixing the other codes should also fix this one since they’re the ones that caused it.
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