What should I do before an inspection?

There is a set of simple checks that may be carried out regularly by the person who drives the vehicle, before taking it to an inspection centre, in particular:

  • Efficiency of the windscreen wipers;
  • Signal lamps: direction indicator, hazard warning lamps, stop lamps, reversing lamps, registration plate lamps, fog lights;
  • Position lamps, dipped beam and full beam headlamps;
  • Tyres: tread depth of at least 1.6 mm;
  • Rear-view mirrors: reflective surface, attachment and adjustment;
  • Correct operation of safety belts.
What does a vehicle inspection consist of?

Mandatory Periodic Inspections were created with the aim of taking action on the condition of vehicles, in accordance with Decree-Law No. 550/99 of 15 December 1999.  
They consist of an inspection of the vehicle's safety systems, through tests with appropriate equipment, performed by qualified technicians.
The correction of the deficiencies found avoids more serious faults from developing and reduces the likelihood of mechanical failures that may lead to accidents.
Vehicle maintenance and preservation can only gain from Mandatory Periodic Inspections. The driver is undoubtedly the main interested party.
By taking the vehicle for inspection, the driver is contributing towards the safety of all those who travel with him.

What procedures is a vehicle subject to in an inspection?

During an inspection the vehicle is subject to a set of test to assess the active and passive safety systems, to ensure that it is roadworthy.

The vehicle is subject to the following procedures:
  1. Identification of the Vehicle - This consists of confirming that the make, model, registration, chassis number and size of the tyres tally with the vehicle registration certificate;
  2. Emission of Pollutants - The testing of the emission of pollutants is performed by two devices: the exhaust gas analyser for petrol vehicles, or the opacimeter for diesel vehicles;
  3. Chassis and Cab - An examination of the exterior and interior of the vehicle is carried out in order to detect corrosion points, deformations, anomalies of the seats and other deficiencies that may compromise the safety of the vehicle and its occupants;
  4. Lights - The alignment of the dipped beam and full beam headlamps and fog lights is checked as well as their intensity, through a regloscope. The condition and operation of all the lamps and connections for trailers where they exist are also checked;
  5. Visibility - The condition of the rear-view mirrors, windscreen cleaning system and any reductions to the driver's field of vision;
  6. Other Equipment  - The existence and functioning of the following are checked: safety belts, warning triangle, audible warning device, speedometer and other mandatory equipment in certain vehicles - tachograph, fire extinguisher, curtains, wheel chocks and others;
  7. Brakes - A Roller Brake Tester is used to test the brakes. It measures the force and balance of the parking brake and emergency brake;
  8. Steering - The wheel alignment is determined by the slide slip tester, which checks wheel balance;
  9. Wheel Play Detector - The wheel play detector makes it possible to detect excessive play or anomalies in the suspension, steering, axles and their connections to the chassis. The condition of the rims and tyres are also checked;


Other Checks - Public service vehicles are also subject to other checks, to ensure that they comply with existing specific safety measures.


Can tyres with different measurements from those indicated on the registration certificate (or single document) be fitted?

 These tyres should not be fitted. The movement of vehicles in these circumstances, even if the tyre size is the same as that prescribed, shall be deemed to be an alteration of the characteristics of the vehicle and may lead to the imposition of a fine and the seizure of the vehicle documents.

The alteration of the size of the tyres to non-identical measurements or measurements which differ significantly from those prescribed may lead to changes to the vehicle's dynamic behaviour and excessive wear of various components.