A used car listing has a set of fields the seller can fill in. I checked how often they actually do, across 329,674 listings.
| Field | Missing | Share |
|---|---|---|
| Condition | 217,624 | 66.0% |
| VIN | 205,447 | 62.3% |
| Colour | 159,431 | 48.4% |
| Drivetrain | 155,302 | 47.1% |
| Transmission | 99,678 | 30.2% |
| Mileage | 48,303 | 14.7% |
Mileage is the exception
Only 14.7% of listings omit the odometer reading, and among sellers who identify themselves it's better still — 99.6% of private sellers and 98.1% of dealers include it.
That's the field everyone knows determines the price. Leave it out and buyers assume the worst, so it gets filled in almost universally. Everything else is optional in practice.
The missing fields aren't random
Condition (66% missing) is the easiest to skip and the least informative anyway. It's a dropdown of adjectives the seller picks for their own car — no buyer treats it as evidence, and plenty of sellers don't bother.
VIN (62.3% missing) is the one that matters. It's the only field that lets you verify everything else independently. Dealers publish it 69.3% of the time and private sellers 15.8%, a gap we went through in 84% of private sellers won't show you the VIN.
Drivetrain (47.1% missing) costs buyers real money. Whether a truck is 2WD or 4WD changes its value by thousands, and nearly half of listings don't say. If you're filtering searches by drivetrain, you're silently excluding half the market.
Transmission (30.2% missing) matters most on the cars where it's rarest. Manual cars are about 5% of the market and command a premium, so a manual seller has every reason to state it — meaning a blank transmission field is usually an automatic.
The listings with no mileage are the strange ones
The 48,303 listings without an odometer reading average $17,278 against $15,988 for listings that include it — and they're slightly newer, 11.9 years against 12.4.
So these aren't sellers hiding a worn-out car. Higher-priced, newer vehicles are more likely to be posted by someone who wrote three lines and a phone number, or by a dealer whose feed didn't populate the field. Missing data reflects effort more often than deception.
How to work with an incomplete listing
Treat blank fields as questions, not answers. If drivetrain isn't listed, ask. Sellers answer these instantly and it costs you one message.
Filter less. Search filters operate on structured fields, so filtering by colour excludes 48% of the market and filtering by drivetrain excludes 47%. Search broadly and sort manually.
Ask for the VIN first. It's the field that makes every other one verifiable — build specification, drivetrain, engine, title history, open recalls. A VIN check fills in most of what the listing left blank, and it does it from a record rather than from the seller's memory.
A refusal is information. Missing fields usually mean a lazy listing. A seller who actively declines to provide the VIN when asked is a different situation entirely.
Frequently asked questions
Why do so many car listings leave out details?
Mostly effort rather than concealment. Only mileage is filled in almost universally, because everyone knows it sets the price. Condition (66% missing), VIN (62.3%) and colour (48.4%) are optional fields most sellers skip.
Should I worry about a listing with no mileage?
Not necessarily. Listings without an odometer reading average $17,278 and 11.9 years against $15,988 and 12.4 years for listings with one — they're newer and pricier, suggesting a sparse listing rather than a hidden problem.
Does filtering used car searches hide listings?
Yes, substantially. Filters work on structured fields, so filtering by colour excludes 48.4% of listings and by drivetrain 47.1% — including cars that match your criteria but never filled the field in.
What's the most important missing field?
The VIN, absent from 62.3% of listings. It's the only field that lets you verify everything else — build specification, drivetrain, title history and open recalls — from records rather than from the seller's description.
Denis Kataev is a serial solopreneur and the founder of ForCar. With 15+ years in software engineering and 10 years in SEO, he builds data-driven products end to end — backed by a sharp eye for design. At ForCar he mines proprietary vehicle datasets, turning raw numbers into buying advice you can actually trust.
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