Queensland Mod Code Reference Guide
Your complete reference to Queensland vehicle modification codes. Find out which mod codes apply to your planned modifications and what certification you need.
Find Your Mod Code
Use the search and filter tools below to find the modification code relevant to your vehicle project. Each code links to our detailed service page with pricing, process, and booking information.
Equivalent Engine Change
Covers the replacement of an engine with one of equivalent capacity and power output from the same or different manufacturer. Commonly required when swapping a like-for-like engine in a light vehicle.
Example:
Replacing a factory 2.8L diesel with another manufacturer's 2.8L diesel of similar power output.
✓ Mod plate required
View service detailsPerformance Engine Installation
Applies when installing an engine with greater power or capacity than the original. This includes engine swaps that increase vehicle performance beyond the manufacturer's specification.
Example:
Installing a V8 engine into a vehicle that originally came with a 4-cylinder.
✓ Mod plate required
View service detailsTurbo or Supercharger
Required when adding forced induction (turbocharger or supercharger) to a naturally aspirated engine, or modifying an existing forced induction system beyond manufacturer specifications.
Example:
Fitting an aftermarket turbo kit to a naturally aspirated petrol engine.
✓ Mod plate required
View service detailsTransmission Change
Covers changes to the vehicle's gearbox or transmission type — such as converting from automatic to manual, or replacing the transmission with a non-standard unit.
Example:
Converting an automatic 4x4 to a manual gearbox for improved off-road control.
✓ Mod plate required
View service detailsDifferential Changes
Applies to changes in differential ratio, type, or configuration. This includes fitting lockers, upgrading to heavy-duty differentials, or changing the final drive ratio.
Example:
Installing a differential locker or changing diff ratios after fitting larger tyres.
✓ Mod plate required
View service detailsSeating Changes & Reduction
Required when changing or reducing the number of seating positions in a light vehicle. Commonly used for camper conversions, wheelchair access modifications, or cargo area expansions.
Example:
Removing rear seats in a van to create a cargo or sleeping area.
✓ Mod plate required
View service detailsChild Anchor Points
Covers the installation, relocation, or addition of child restraint anchor points (top tethers and ISOFIX mounts). Essential for families fitting child seats in modified vehicles or older cars without factory anchor points.
Example:
Adding top-tether anchor points to a classic vehicle or relocating anchors after a seating change.
✓ Mod plate required
View service detailsFuel Tank Change
Applies when replacing or adding a fuel tank that differs from the manufacturer's original specification — including long-range fuel tanks, dual-tank setups, or LPG conversions.
Example:
Fitting a long-range diesel tank for extended outback touring.
✓ Mod plate required
View service detailsHelpful Australian Resources
The following links lead to official Australian government and non-commercial resources relevant to this service. We recommend reviewing these for additional guidance on vehicle modification regulations and safety standards.
Official Queensland Department of Transport and Main Roads guide to vehicle modification requirements and approved person scheme.
Queensland Government — TMRThe national code of practice for light vehicle modifications, covering all mod codes and engineering requirements.
Australian Government — DITRDCANational standards for vehicle safety, emissions, and anti-theft performance applicable to all road vehicles in Australia.
Australian Government — DITRDCA
