Usually there is no restriction in custom supplied components, which would void repairs by third parties (i.e. you). In most environments you are whoever not al

Usually there is no restriction in custom supplied components, which would void repairs by third parties (i.e. you). In most environments you are whoever not allowed to drive with hands of the steering wheel or if not mentioned explicitly you are not allowed to create unsafe conditions (which where I live means you have to be in control, even with driving aides) Placing a can monitoring and loggin tool on the obd port is perfectly legal afaik. Sneeky spyware installing insurers do it all the time. For manipulation via can: ymmv depending on what modifications need to be applied and what security is broken (if any) and you should ask your insurer what they cover. The insurance part is my biggest concern.