If you’re booking a safety certificate in Brisbane or Logan, knowing what commonly fails can save you time, money, and a second inspection.
We’ve pulled together the most common issues we see across mobile roadworthy inspections and workshop checks, based on real-world inspections and current Queensland safety requirements.
Top Reasons Vehicles Fail a Roadworthy
1. Oil Leaks in the Engine Bay
Oil leaks are still one of the biggest reasons vehicles fail.
If oil is leaking onto the ground or onto hot components like the exhaust, it’s an automatic fail under Queensland standards. Even small leaks from rocker cover gaskets or seals can be enough to fail inspection.
Quick tip: A clean, dry engine bay gives you a much better chance of passing.
2. Suspension & Steering Wear
Worn or damaged components, such as:
- Sway bar links (torn boots)
- Control arm bushes (cracked or split)
- Ball joints (excessive movement)
These affect handling and safety, and are closely checked during inspections.
3. Tyres Below Legal Tread
Tyres must have at least 1.5mm tread depth across the tyre.
We also see failures from:
- Uneven wear
- Cracking or perishing
- Mismatched tyres are affecting stability
4. Battery Not Secured Properly
This one catches a lot of people off guard.
- Loose batteries
- Missing brackets
- Corroded or loose terminals
These are all safety risks and will result in a fail.
5. Split CV Boots
CV boots keep grease inside critical drivetrain joints.
If they’re:
- Split
- Leaking grease
- Contaminated
They’ll fail inspection and usually need replacement.
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6. Warning Lights on Dashboard
If any of these are on, it’s a fail:
- Check engine light
- ABS light
- Airbag light
These indicate active faults that need to be diagnosed and fixed properly.
7. Brake-Related Issues
Common fails include:
- Worn brake components
- Poor braking performance
- Damaged brake pedal rubber
Even small things like worn pedal rubber can fail — because it affects control under braking.
8. Lights & Visibility Issues
We regularly see failures for:
- Faded or cloudy headlights
- Faulty indicators or brake lights
- Poor visibility at night
Headlights must be clear and working properly — this is a major safety item.
9. Windscreen Damage
Cracks or chips, especially in the driver’s line of sight, are a common fail.
Small chips can often be repaired early — but if left, they usually turn into full replacements.
What a Safety Certificate Is and Isn’t
A safety certificate is a point-in-time inspection, not a full mechanical check.
It confirms your vehicle meets minimum safety standards at the time of inspection — it doesn’t assess overall condition or future reliability.
If you’re buying a car, it’s still worth getting a pre-purchase inspection for a more detailed assessment.
What Happens If You Fail a Roadworthy?
If your vehicle doesn’t pass:
- You typically have 14 days to fix the issues (QLD requirement)
- Repairs can be done at a workshop or with a qualified mechanic
- You can then return for a re-inspection
Most failures come down to a few key items — not a full overhaul.
How to Improve Your Chances of Passing First Go
Before booking your inspection:
- Check for visible oil leaks
- Inspect tyres and tread depth
- Make sure all lights are working
- Look for warning lights on the dashboard
- Check that the battery is secure
- Fix any obvious issues early
If you’re unsure, getting it checked beforehand can save you time.
Need Help Getting It Sorted?
At Dr Roadworthy, we don’t just inspect — we help you understand what needs fixing and get it sorted properly.
Whether it’s a mobile safety certificate across Brisbane or repairs at our Park Ridge workshop, we focus on clear advice, no guesswork, and getting you back on the road quickly.
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