After the vehicle has cleared customs, it must go through a battery tests and conversions to ensure that the vehicle is fit for use on Japanese roads. Those tests and conversions include the following:
- Gas Test. Done to determine what type of fuel was used in the vehicle prior to importation to Japan as well as which fuel sold in Japan will be suitable.
This tests also determines what type of equipment must be removed and installed in the vehicle so that it may safely use Japanese fuels.
- Conversion. After the Gas Test determines the various factors pertaining the vehicles fuel use, the proper alterations are then made.
- Supplemental. After all alterations are made, the vehicle undergoes another series of tests to ensure that all equipment has been installed properly and that there is no leakage of fuel.
After the conversion and inspection have been completed, the vehicle has to be registered. At this time, the vehicle is subject to the following taxation and fees:
1. Vehicle tax
2. Weight tax
3. Proof of adequate parking facilities fee
4. Registration fee
5. Insurance fee
In sum, these taxes and fees amount to approximately 10%-12% of the vehicles value.
Registration takes approximately 1 week. In total, after customs clearance, the vehicle can be used in Japan after about 2-3 weeks. | 
