How to Check a Car Before Buying It

Why a visual inspection isn't enough

A great-looking exterior tells you very little about a car's technical condition. Many problems — from electronic faults to a past accident — go unnoticed in a regular walkaround.

What diagnostics should check

Independent diagnostics lets you find out: whether old, uncleared fault codes are stored; whether the safety systems (Airbag, ABS) are actually ready; and whether the odometer reading (based on data from one of the control units) is consistent with what the seller claims.

Turning off the light doesn't fix the problem

Sometimes a seller simply clears a fault code before selling, temporarily switching off the warning light without actually fixing the underlying issue. That's exactly why an independent, objective check — not one done through the seller — matters.

How the report helps you negotiate

If diagnostics finds a fault, that doesn't necessarily mean you shouldn't buy the car — it might just help you negotiate the price, or make an informed decision either way.

When it's best to order diagnostics

Ideally, the check happens before you sign anything — at a location agreed with the seller, before any money changes hands.