I posted this in another thread but probably even more appropriate here.
The ACCC has just released (at 3/9/18) these:
A fact sheet which provides information about what consumers can expect and the remedies available if there is a problem with their new car -
https://www.accc.gov.au/system/files/Just-bought-a-new-car.pdf which particularly states -
"
Major failures - This type of failure happens when: (amongst other things)
the failure creates an unsafe situation (e.g. your car has a fault that affects your ability to brake or steer the car easily).
Type of remedy
You can ‘reject the car’ (which typically requires you to return it) and choose between a repair, replacement or refund. You should clearly advise the supplier that sold you the car (e.g. the car dealer) if you intend to reject it, and explain why – e.g. the car is not drivable, or the car was not repaired within a reasonable time, etc.
You may also be able to recover ‘reasonably foreseeable’ damages for any loss or damage you suffered from the supplier that sold you the car (e.g. the car dealer), or in some cases from the manufacturer."
And a motor vehicle sales and repairers guide to help authorised dealers, vehicle manufacturers, independent repairers, and other businesses within the industry by providing an in-depth explanation of industry rights and obligations under the ACL -
https://www.accc.gov.au/system/files/Motor-vehicle-sales-and-repairs-guide.pdf
This guide particularly states that - "
Where a consumer asks a dealer to deal with a problem where a vehicle:
• is not of acceptable quality, or
• does not match a description provided by or on behalf of the manufacturer,
or
• is not fit for a purpose made known to the manufacturer either directly or through you as the dealer
and in dealing with that problem in accordance with the dealer’s legal obligations the dealer incurs costs, the manufacturer must reimburse the dealer for the costs that the dealer properly incurs."
As such, I would expect that any diagnostic cost that results in a required repair under consumer guarantees should be met by the manufacturer rather than the consumer.
I recommend anyone with issues with their vehicle read these documents and politely raise their content with their dealer when / if the need arises.