AUCN DATA
Used car risk and market data, in one place
AUCN publishes the percentages behind its vehicle history checks — how often finance is still owing, which vehicles carry written-off and stolen records, how common odometer anomalies are, and what the market data says about value retention. Every figure comes from AUCN's own national check and listing data.
Updated 30 September 2026 · reviewed monthly
Index reading · Sep 2026
The AUCN Risk Index: September 2026 reads 97.2
A monthly composite of finance owing, written-off and stolen rates across Australian used cars, with 2023 as the baseline of 100. Down 2.6 points on August and below baseline for the first time since early 2025.
Risk data
10.8% finance · 8.6% written-off
Nearly 1 in 4 used cars carry a hidden risk flag
The flagship read: 22.8% of checked vehicles carried at least one flag, and risk peaks at 4–7 years old rather than on old cars.
Read the data →Finance owing by brand
Which brands are most likely to still have finance owing
Trucks run 32–39%, Tesla and BYD near 30%, while older budget cars sit under 7%. Includes the vehicle-type and age breakdown.
Read the data →≈4× the car rate
Motorcycles top the stolen list by a wide margin
Motorcycles carry stolen records at 2.50% against 0.64% for passenger cars, as national vehicle theft hits a 17-year high.
Read the data →State-by-state comparison
Written-off rates are twice as high in some states
SA, QLD and WA run at 1.65–1.81× the Victorian rate. See the state table, the age pattern and what it means for interstate buys.
Read the data →≈1 in 24 checks
About 1 in 24 cars shows an odometer anomaly
4.2% of checks flag an odometer anomaly, peaking on 8–11-year-old vehicles. Includes the brand pattern and how to verify a reading.
Read the data →Market data
How to read these numbers
Read this first
Methodology, definitions and limitations
How every percentage is produced: definitions for each risk flag, the valuation method, the limitations, and the citation format for media and researchers.
Read the methodology →How we work
Editorial standards: how AUCN produces its guides and data
Who writes our content, how figures are checked, how external sources are used, what we refuse to publish, and how corrections work.
Read our standards →Check a specific car
The percentages tell you the odds. A vehicle history check tells you about the car in front of you — finance owing, written-off history, stolen status and odometer records.
Run a vehicle check →All figures are aggregated percentages published by AUCN and are reviewed monthly. See the methodology and definitions for how each number is produced, and how to cite it.