Feature article

WOF Ready: What Passes, What Fails, and the Surprising Fails You Didn't See Coming

Learn what’s required for a Warrant of Fitness in NZ.

1 May 2026

By Jess Hickman (Motors Content Creator and Senior Designer)

Getting a Warrant of Fitness (WOF) can feel like a bit of a lottery. You drive in hoping for the best, but sometimes get hit with a failure for something you didn't even know was a problem. In Aotearoa, a WOF is a mandatory regular check to ensure your vehicle meets crucial safety standards. While most of us know to check the basics, some of the reasons for failure can be unexpected. Here's a breakdown of what inspectors are looking for, the common culprits for a fail, and those surprising issues that can catch you off guard.

The Must-Haves: What Passes a WOF

To pass a WOF, your car needs to be in good condition, with all its safety features in good working order. This isn't just about avoiding a fine; it's about keeping you and everyone else on the road safe. Here’s a quick rundown of the key areas that are checked:

Things to check

Tyres	Tyres	Must have a tread depth of at least 1.5mm around the entire tyre. They also need to be free of damage like cracks, bulges, or exposed cords.	Must have a tread depth of at least 1.5mm around the entire tyre. They also need to be free of damage like cracks, bulges, or exposed cords.
Brakes	Brakes	Your footbrake and handbrake must be in good working order, with no leaks in the brake system. This is tested on a brake roller machine, that rotates the wheels and measures braking force. An imbalance of braking force compromises your ability to stop safely.	Your footbrake and handbrake must be in good working order, with no leaks in the brake system. This is tested on a brake roller machine, that rotates the wheels and measures braking force. An imbalance of braking force compromises your ability to stop safely.
Lights	Lights	All your lights need to be working – headlights (both high and low beam), brake lights, indicators, and even the number plate light.	All your lights need to be working – headlights (both high and low beam), brake lights, indicators, and even the number plate light.
Structure	Structure	The vehicle's body must be free from significant rust, especially in structural areas like around seatbelt mounts.	The vehicle's body must be free from significant rust, especially in structural areas like around seatbelt mounts.
Visibility	Visibility	Your windscreen needs to be clean and free of large cracks in the driver's line of sight. Wipers and washers must work effectively.	Your windscreen needs to be clean and free of large cracks in the driver's line of sight. Wipers and washers must work effectively.
Safety Belts	Safety Belts	Seatbelts must be in good condition, without any fraying or damage, and the buckles must work correctly.	Seatbelts must be in good condition, without any fraying or damage, and the buckles must work correctly.
Steering & Suspension	Steering & Suspension	The steering must be safe and secure, and the suspension systems need to be in good working order.	The steering must be safe and secure, and the suspension systems need to be in good working order.
Exhaust	Exhaust	Your exhaust system must be secure, without any leaks, and it can't be excessively noisy or smoky.	Your exhaust system must be secure, without any leaks, and it can't be excessively noisy or smoky.

The Common Culprits: Why Most Cars Fail

It's often the little things that trip people up. According to the Motor Trade Association, around 40% of vehicles fail their WOF on the first inspection, and the reasons are surprisingly simple.

Common culpritts

Lights, Lights, Lights: A blown bulb is one of the most frequent reasons for a WOF failure. It's easy to miss a faulty brake light or indicator when you're always inside the car.
Worn Tyres: Tyres are a close second for common failures. It’s not just about tread depth; uneven wear or damage to the tyre wall can also lead to a fail.
Brake Issues: If it’s evident your vehicle has worn brake pads, cracked brake hoses, brake imbalance or a spongy pedal these are red flags for inspectors.
Wiper Woes: Ineffective or worn-out wiper blades are another common, and easily preventable, reason for failure.

The Surprising Fails: What You Might Not Expect

Beyond the usual suspects, there are a few less-obvious things that can result in a failed WOF.

These are the ones that often leave car owners scratching their heads.

Airbag Warning Light: If your car's airbag warning light is on, it's an automatic fail. This indicates a fault in the airbag system, which is a critical safety feature.
Speedometer Not Working: You might be used to judging your speed by the flow of traffic, but a non-functioning speedometer is a no-go for a WOF.
Sun Visor Can't Hold Its Position: That floppy sun visor that won't stay up? It's more than just an annoyance; if it can't hold its adjusted position, it's considered a safety hazard and a reason for failure.
Fuel System Leaks: Even a minor fuel leak is a serious fire hazard and an instant WOF fail.
Modified Exhausts without Certification: If you've got a custom exhaust, it needs to be certified by the Low Volume Vehicle Technical Association (LVVTA) to be legal.
Excessive Play in Steering: (REVISED SECTION) If your steering feels a bit loose, it could be a sign of worn components. This "play" will be picked up by an inspector and can lead to a fail. Wear-and-tear on steering and suspension components can vary between makes and models, and it shows why the independent WOF standard is so important. In one recent case, a Tesla Model 3 owner had their car fail a WOF due to excessive play in the ball joints, even though the manufacturer had initially deemed it within their own specifications. This highlights that NZTA regulations are the final word for all vehicles on NZ roads, ensuring a consistent safety standard regardless of brand.

WOF vs. Servicing: Is a WOF a Guarantee of Safety?

This is a critical point to understand: a WOF is not a guarantee of your vehicle's safety. A Warrant of Fitness confirms that on the day of the inspection, your vehicle met the minimum required safety standards. It does not guarantee that the car will remain safe for the 6 or 12 months until the next check is due but ensures that is of a roadworthy standard at the time of testing.

Parts like tyres and brake pads can wear out or fail at any time. Furthermore, a WOF inspection does not cover the overall mechanical health of your vehicle. Key components like the engine, gearbox, clutch, and cooling system are not part of the check. This is where regular servicing comes in.

A vehicle service is a comprehensive health check that focuses on your car’s reliability and operational condition. It includes changing the oil and filters and inspecting the engine, transmission, and other mechanical parts that a WOF doesn't look at. To keep your car safe and reliable, you need both.

Think of it this way

WOF: A regular, mandatory check of specific safety features.
Servicing: The ongoing maintenance that looks after your car's overall health and longevity.

To avoid the hassle of a failed WOF, it pays to do a quick check of your own before you go in for an inspection. And remember, combining regular servicing with your WOF checks is the best way to ensure your car is always in good shape, keeping you and others safe on the road.

Disclaimer: The information in this article is for general guidance and comparison purposes only. For the most accurate and specific details on vehicle performance and pricing, we always recommend speaking directly with a registered motor vehicle dealer.

Author

Jess Hickman

Motors Content Creator and Senior Designer

By day, Jess is a Senior Designer and Content Creator at Trade Me, turning car-selling into plain English and good design. By night, she’s usually wrangling fonts, children, or both. She loves helping Kiwi navigate the vehicle market with guides that are clear, useful, and occasionally even fun (yes, fun and cars can go together).