Hi, just to clarify - you bought the vehicle second hand?
This article may provide some background info for you:
Faulty Second Hand Car? Your Options as a Buyer - Legal Blog - LawAnswers.com.au
Essentially, the Australian Consumer Law will apply to a purchase from a used car dealer, which requires the dealer to guarantee that the vehicle is
- of acceptable quality (which can depend on the age and nature of the vehicle),
- reasonably fit for the purpose specified during sale, and
- accurately described.
A used vehicle is considered to be of 'acceptable quality' if for a reasonable period after purchase you can drive it from A to B in reasonable safety. If a vehicle is not of acceptable quality or a manufacturing defect has become evident during a reasonable period after purchase, the manufacturer has an obligation to remedy the defect. A reasonable period is usually regarded as the warranty period provided by the manufacturer.
In such circumstances you generally don't have a right of refund.