I think removing airbag sensors and abs is the exact reason. Unless he reprogrammed the computer, which idk if that is even possible to that extent, the computer is still trying to read all of the abs sensors and airbag sensors. Since it can't, it thinks there is a malfunction with pretty much every electronic safety feature. I'm not sure if he could pass inspection with those lights. At least in MA you couldn't.
Is there a way to retrofit all of the sensors to the D60?