AUCN Data: Nearly 1 in 4 Used Cars Carry a Hidden Risk Flag

If you are buying a used car in Australia, the question is not whether something could be wrong. The question is how often something actually is.

AUCN analyses the outcome of every PPSR and vehicle-history check it runs. Across all checks through September 2026, nearly one in four vehicles carried at least one risk flag: finance owing, a written-off record, a stolen record, or an odometer anomaly.

Every figure below is a percentage, drawn from AUCN's own check data — and each one comes with what it means for your decision.

The four risks, by the numbers

Two numbers deserve the most attention:

• About 1 in 9 vehicles still had finance owing when checked.
• About 1 in 12 had a written-off history.

Both are exactly the risks a PPSR search exists to uncover. The official PPSR service is run by the Australian Financial Security Authority (AFSA), and a vehicle search costs $2 — which is why the check is the cheapest form of protection in the whole transaction.

One check, multiple risks

Risk flags overlap. A car can have finance owing and a past write-off, or an odometer anomaly and stolen history.

That is the real headline: a "clean car" is not the default assumption. It is something you verify — before money changes hands, not after.

Where you buy changes the odds

Risk is not evenly spread across Australia.

The state ranking by overall risk

Western Australia tops the national ranking when all four flags are combined, and the spread between the highest and lowest state is nearly nine percentage points.

Written-off history by state

The gap is striking: write-off flags in QLD, WA and SA run at 1.65–1.81 times the Victorian rate — and close to three times the New South Wales rate of 4.2%. Severe weather — hailstorms and flooding — plus long distances and harder operating conditions help explain why.

It also means an interstate import deserves extra scrutiny. Every state runs a written-off vehicle register, and the Victorian and Queensland systems are good places to start reading about how the registers work.

Finance owing by state

Finance owing is far more uniform across the country — every state sits in roughly the 9–12% range. Stolen records are rarer overall (0.7%), with Tasmania recording the lowest stolen rate in AUCN's data.

Odometer anomalies are more common than people think

About 4.2% of checks show an odometer anomaly — evidence that the recorded odometer history does not line up with the current reading. The typical patterns:

• a recorded reading that is later lower than an earlier reading
• a sudden jump in one year that does not fit the vehicle's history
• low kilometres for age with no supporting service records

An anomaly flag is not proof of fraud on its own. But it is a reason to slow down, ask for the logbook, and verify service stamps against the odometer before you pay.

What the brands tell you

• Finance concentrates in expensive, newer vehicles. Commercial trucks run at 32–39%, Tesla and BYD sit near 30%, and Haval, LDV, Chery and Porsche cluster in the 23–28% range.
• Older, cheaper cars are the cleanest on finance — Daihatsu, Honda, Suzuki and Subaru all sit below 7%.
• Motorcycles dominate the stolen list: KTM, Husqvarna and Yamaha show stolen rates far above mainstream cars. Nationally, the ABS recorded 66,625 motor vehicle theft victims in 2025, the highest in 17 years.
• Write-off history is its own pattern. It peaks not on prestige brands but on high-volume models with long production runs — Mazda (16.4%), Audi (14.8%), Kia (13.7%) and Honda (13.5%) lead the data.

Each of these patterns has its own deep-dive: finance owing by brand, stolen records, written-off rates by state, odometer anomalies and value retention by age.

Risk peaks in mid-age cars, not old ones

The most counter-intuitive finding in the data: risk does not rise with age — it peaks in the middle.

The reasons differ by age band, and each has a different lesson for buyers:

• 0–3 years: risk is almost entirely finance — 26.2% still carry a security interest, because the loan is young.
• 4–7 years: the highest-risk window overall at 39.9%. Finance is still common (23.8%) and write-offs climb to 11.3%.
• 8–11 years: write-off history peaks at 12.0% and odometer anomalies peak at 7.4% — this is where history gets messy.
• 12–15 years: finance falls away (8.5%), but write-offs are still above 10%.
• 16+ years: the cleanest group by percentage — most finance is long discharged, and the cars still on the road have survived.

That lines up with the national fleet: the ABS Motor Vehicle Census puts the average age of Australian vehicles at 10.6 years, with Tasmania the oldest at 13.3 years.

Vehicle type changes the odds too

• Trucks and heavy vehicles carry the most risk (31.8%), driven by finance at 19.4% — they are business assets with long finance terms.
• Passenger cars sit at 24.8%, with write-offs at 10.4%.
• Utes and light commercial vehicles are close behind at 23.5%, with finance at 13.8% but a lower write-off rate (6.4%).
• Motorcycles show the lowest overall risk (15.7%) but the highest stolen rate of any category at 2.50% — almost four times the passenger-car rate. Odometer data is not returned for motorcycles, so this category figure understates their risk profile: on stolen records alone they lead every category.
• Caravans and trailers are the cleanest on history (15.1%), though 8.7% still carry finance.

One in fourteen checked vehicles had expired registration

Across the checks where a registration record was available, 7.0% of vehicles had an expired registration at the time of the check.

That matters for two reasons: an unregistered vehicle cannot legally be driven on the road (and is usually uninsured), and an expired rego often signals a car that has been sitting unused — which brings its own risks around brakes, tyres, fuel systems and battery condition.

Risk levels are stable — but finance is creeping up

Across the last four full years of checks, the overall share of vehicles with at least one flag has stayed in a narrow band around 22–24%. Within that, the mix has shifted:

• finance owing has moved from around 10.1% to 11.1%
• written-off history has edged from 8.4% to 9.0%
• odometer anomalies have fallen from 4.9% to 2.0%

In other words, the market is not getting dramatically riskier — but the balance of risk is moving toward finance and write-off history, which are exactly the two things a PPSR search settles in a single $2 check.

If you are buying

1. Run the PPSR check first. Finance, written-off and stolen status in one search — before you inspect, not after you agree on a price.
2. Confirm the rego. Check the plate matches the VIN and the seller's documents. In NSW you have 14 days to transfer registration; in Queensland the same 14-day rule applies. A seller who wants to skip the paperwork is a warning sign.
3. Match the odometer against records, not just the dashboard.
4. Treat 8–14-year-old cars with extra care — that is where flags concentrate.
5. If finance shows up, get a payout letter and confirm the security interest is discharged before settlement.
6. Know your protections. Used cars bought from a dealer come with guarantees under the Australian Consumer Law, separate from any manufacturer warranty.

If you are selling or trading in

Sellers are checked too — and a clean report is a selling tool:

• Clear finance before listing. A payout letter plus a $2 PPSR search showing no security interest removes the biggest objection a buyer has.
• Keep the service history together. Every odometer anomaly flag started as a missing or inconsistent record.
• Expect a written-off history to be priced in. If the car has repair history, a buyer will find it, so disclose it early and price accordingly.
• Offer the report to buyers. A seller-provided PPSR search shortens negotiation and reduces dispute risk.

If you are a dealer or buying stock

• Screen every trade-in and auction purchase — trucks and late-model EVs are the highest finance-risk categories in the data.
• Refresh checks on aged stock. Finance can be registered against a vehicle after you buy it, and ORI registrations can be added by a previous owner's lender.
• Document each check in the vehicle file to support compliance and dispute resolution.

The bottom line

AUCN's own data shows that a used car with a completely clean history is not the majority default — it is a finding you confirm. Nearly 1 in 4 vehicles carries at least one risk flag, and finance or write-off issues alone appear in about 1 in 5.

The good news: almost every one of those risks is discoverable in minutes with the right check — before you pay, and before the problem becomes yours.

Sources

• PPSR — About the PPSR (Australian Financial Security Authority)
• ABS — Motor Vehicle Census, Australia
• ABS — Recorded Crime: Victims, 2025
• Service NSW — Transfer a vehicle registration
• Queensland Government — Registration transfer
• VicRoads — Buy, sell or transfer a vehicle
• Australian Consumer Law

About this data: AUCN Data, percentage basis, based on AUCN PPSR and vehicle-history checks through September 2026. Figures are aggregated percentages only; no individual vehicle or personal information is published. Written-off rates reflect vehicle age, model mix and operating environment and are not a measure of brand quality. External figures are quoted from the sources listed above. See the AUCN Data methodology and definitions for how these figures are produced.