It's typically required that your vehicle go through a mechanical inspection before you can renew the registration for that vehicle to ensure it's roadworthy and safe. In Australia, each state may have some varying rules about this inspection, but note some general information to keep in mind when you need to have this inspection scheduled. This will ensure you know what's typically included and how to properly schedule this vehicle registration inspection.
Inspectors must be authorized
Note that only authorized inspectors are allowed to perform this inspection; to find an authorized mechanic or shop in your area, it's best to log onto the website for the state in which you live and look for registration information. These sites will have a list of authorized inspection sites, or AIS, in your area. If you choose one from their list, you know the inspection will be valid and performed properly.
Mechanical problems don't necessarily mean failure
Your vehicles can have some mechanical problems and everyday wear and tear but still pass the inspection. The level of damage and the safety of the vehicle are typically the concern to an inspector. For example, the inspection will usually check for rust, but this would mean rust along parts that could affect the safety and performance of the car, such as the exhaust system or tie rods. A few spots of rust along the body may not affect the car's performance or safety, so it may not affect the report prepared for your car. Standard wear and tear on the brakes, suspension and other parts also won't necessarily mean a failed inspection, as long as those parts are not so worn that they need replacement or immediate repair.
Inspections should be scheduled thoughtfully
Note that a safety inspection is typically valid for only six months after the date of the inspection; don't schedule it too soon before you plan on renewing your registration, and don't let too much time lapse after the inspection to renew that registration. If you do, you'll need an entirely new inspection done and will need to pay for it again.
However, if the car fails the inspection, you should be given a list of what needs repairs. You cannot get a new registration until those repairs are made; if you know your car is in poor mechanical shape, you might want to ensure you get the inspection scheduled in enough time to get that list of needed repairs and make an appointment with your mechanic. This will ensure you get the car fixed and reinspected and then properly registered before your current registration expires.