Vehicle inspection day: what they check (and why keeping up with maintenance helps you pass)

For most drivers, the annual vehicle inspection — whether it’s the MOT in the UK, the ITV in Spain, or an equivalent test elsewhere — arrives with a mild sense of dread. The paperwork side is straightforward enough: in Spain, for example, the only document you must physically present is the vehicle’s inspection card (tarjeta de inspección técnica). The circulation permit and proof of insurance are also required, but the station can verify them electronically via the traffic authority — though bringing them anyway speeds things up. The dread, then, isn’t really about the paperwork. It’s that the result depends on the actual state of the car. And if something isn’t right, failure arrives without much warning.

The reassuring part is that the most common reasons for failing aren’t surprises. They’re things that preventive maintenance would have caught first.

What they actually check

The inspection assesses the vehicle across several areas. Inspectors won’t tell you what to fix or how — they verify that the car meets minimum safety and environmental requirements at that point in time.

Here are the main things that get checked:

Brakes. Braking efficiency is measured on each axle, along with the difference between wheels on the same axle. Worn brake pads, deteriorated discs, or degraded brake fluid can all cause failures.

Lights and signals. Every headlight, tail light, indicator, and reflector is checked for operation and alignment. A blown bulb or misaligned headlights are minor defects, but several minor defects together can add up to a failure.

Tyres and steering. Tread depth, pressure, and visible damage to the sidewalls are all checked. So is wheel alignment and the general condition of the steering system. Worn tyres or incorrect pressure are straightforward failures.

Emissions. Engine emissions are measured against limits based on fuel type. A poorly tuned engine, a dirty air filter, or combustion problems can push emissions above permitted levels.

Suspension and underside. Shock absorbers, ball joints, bushings, and visible structural elements are inspected. Excessive wear on any of these components can generate defects.

Bodywork and identification. The chassis number must be legible and match the documentation. Bodywork in poor condition that poses a risk to other road users will also be flagged.

Most failures were foreseeable

What nearly all serious defects have in common is that they don’t appear suddenly. Brakes wear progressively. Tyres lose tread depth with use. Brake fluid degrades over time even if untouched. Shock absorbers gradually lose effectiveness with mileage.

If you track your car’s maintenance — you know when the brakes were last changed, when the tyres were last checked, when the brake fluid is due for replacement — it’s very unlikely you’ll arrive at the inspection with any of those points in a critical state. Not because you prepared specifically for the test, but because the car was already up to date.

Inspections don’t fail well-maintained cars. They fail cars that haven’t been looked after.

What’s worth checking before you go

Without taking the car to a garage before every inspection, there are things you can check yourself in ten minutes: that all lights work (headlights, rear lights, indicators, reverse light), that tyres have sufficient tread and are at the correct pressure, that wipers clear the windscreen properly, and that no warning lights are showing on the dashboard.

If your maintenance is up to date, those checks are almost a formality. If it isn’t, they might reveal a surprise.

Keeping track of the date

Inspection intervals vary by country and vehicle age. In Spain, for example, new cars have four years before the first ITV, then every two years up to ten years old, and annually after that. In the UK, most cars need an MOT every year from three years old. Missing the deadline means a fine on top of everything else, so it’s worth keeping the date somewhere you’ll actually see it.

OwnAutoCare lets you log your next inspection date alongside the rest of your vehicle history, so you get a reminder before the deadline creeps up — the same place where you keep your service records, garage receipts, and maintenance reminders.

Arriving at the inspection with a well-maintained car won’t eliminate all uncertainty — something unexpected can always show up — but it reduces the chances of an unpleasant surprise considerably. And that, in the end, is exactly what preventive maintenance is for.