Vehicle history: what to check before you even go to view it

The cheapest stage of inspecting a used car is the one done before travelling to see it. Half the bad options are filtered out by VIN, and that saves not money but weekends.

What a VIN gives you

The VIN is the unique body number, and it encodes the basics: year, plant, specification, engine type; the structure is covered in the VIN article.

The first thing to verify: the VIN in the documents equals the VIN on the body equals the VIN on the plate. A mismatch ends the conversation rather than starting a clarification.

Where to look on the body: usually under the windscreen, in the driver’s door aperture, under the bonnet, or beneath the floor covering. Exact locations vary by model.

Signs of tampering: restamping marks, wrong fonts, an uneven plate surface, fresh rivets.

What the databases show

The available sources vary by country, but the categories are the same:

Number of keepers — and how quickly they changed. Three owners in a year means the car was passed on for a reason.

Outstanding finance, leasing, or seizure. The most important legal item.

Stolen markers.

Accident history — where such a database exists.

Recorded mileage at inspections — the most accessible way to catch odometer fraud.

Taxi use — recorded in some countries; the consequences are covered in the ex-taxi article.

Recall campaigns — whether they were carried out.

What no database will show

Here the documentary part ends.

Actual mechanical condition.

Accidents never reported to an insurer — and that is most minor ones.

Repair quality after a recorded accident.

Mileage between records — the database sees points, not the intervals.

Engine and gearbox condition.

So database checks filter out, but do not confirm.

What on-site diagnostics adds

The part that cannot be fabricated or hidden in paperwork.

Mileage across several modules — an odometer can be rewritten, but mileage is not stored in one place; covered in the odometer fraud article.

Freeze frames of old codes — they may carry the mileage at the time of the fault. The strongest evidence available.

Readiness monitors — all reset means codes were cleared before the viewing; covered in the readiness monitors article.

Airbag codes — traces of deployment on an “accident-free” car.

Transmission adaptations — reset ones mean recent intervention.

Regeneration statistics on a diesel — a high count at low mileage is a contradiction.

The full protocol is in the used car inspection article.

The procedure

1. Get the VIN before travelling — a seller who will not give it has already answered the question.
2. Check the available databases — finance and keepers first.
3. Verify the VIN physically on site.
4. Inspection and cold start.
5. Diagnostics — codes, monitors, freeze frames.
6. Compare what the car says against the seller and the databases.

In short

• Documents, body, and plate VINs must agree — first and unconditional.
• Databases filter out bad cars; they do not confirm good ones.
• Outstanding finance is the most important legal check.
• Mileage lives in several modules, which is how fraud is detected.
• Reset monitors on viewing day are a reason to ask, not to hurry.

Download the app — codes, monitors, and freeze frames are read with an ELM327 adapter over Bluetooth SPP on Android, right at the viewing.