Why cars fail the roadworthiness test
Belgian test centres (run by GOCA) inspect your vehicle on many checkpoints across several categories: braking, lights, tyres, suspension, exhaust, steering and vehicle identification.
Common reasons for failure are rarely complex:
- Worn tyres (tread below 1,6 mm)
- Brake pads at the end of their life (wear indicator on)
- A blown bulb (dipped beam, number plate, indicator)
- Leaking or overly noisy exhaust
- Engine warning light on (OBD-II)
- Missing documents (green card, certificate of conformity)
Cost of a fail: a re-test to pay for, plus lost time: two appointments, extra trips, half a day wasted. Proper preparation saves you all that.
When exactly should you take the test?
In Belgium, the rules depend on your vehicle's age and use:
- New car: first test at 4 years
- After that: at regular intervals, depending on the car's age and your region; the deadline is on your last inspection certificate
- Used car sale: a "sale" test is mandatory before any transaction (even if recent)
- Import: an import test is required
You can book through the official GOCA website or by phone at any approved Belgian centre (you don't have to go to the one in your town).
The preparation checklist 8 days before your test
- Documents in the car: registration certificate, valid green insurance card, certificate of conformity (COC)
- All lights: dipped beams, main beams, side lights, brake lights, indicators, reversing lights, fog lights, rear number plate light
- Tyres: tread over 1,6 mm on all 4 (wear indicators visible), no bulges, correct pressure
- Glass and wipers: no chips in the driver's field of vision, screen wash full, wiper blades in good condition
- Horn: working
- Seat belts: all belts retract and buckle properly
- Warning triangle + vest: mandatory in the car in Belgium
- Dashboard lights: no warning lights on (engine, ABS, ESP, airbag)
The 5 mistakes that cost you
1. Thinking the "little orange light" is fine
The “Check Engine” (engine) or OBD-II warning light being on can get your car refused even if it drives normally. You need to have the fault codes read and the fault fixed before going to the test. Expect around €60 to €100 for an OBD diagnosis in a workshop (rough guide).
2. Not checking the rear number plate light
Silly but extremely common: the number plate bulb blows and nobody notices (you never see it while driving). Check it with 2 people — someone behind, you switching the lights on.
3. Forgetting an expired green card
The green card (proof of insurance) has an expiry date. If it has expired — even if your insurance is valid — the inspector won't let you through. Check 8 days before.
4. Turning up with borderline tyres
Tread at 1,8 mm = pass. At 1,5 mm = fail. If in doubt, change them. A new tyre: allow ~75-95 € depending on the brand, plus fitting and balancing at a tyre centre (we don't fit tyres at home). Less stress than a 3rd visit to the re-test.
5. Skipping prep on a car over 10 years old
A car over 10 years old fails more often than a recent one. If your vehicle is 10 years or older, preventive preparation is almost essential. OBD diagnosis + 8-point check + adjustments = ~€150, which often saves you €200-400 of urgent repairs after a fail.
Professional preparation: at what price?
You can go to your usual garage for a "pre-test":
- Brand dealership: €80-150 (but often pushes expensive repairs)
- Independent garage: €50-100 (variable quality)
- Car centre (chain): €60-120 (quick but standardised)
- Mobile mechanic (Warehouse Care): the pre-MOT check is included in the full service, from €279 all-inclusive (oil change, filters, brakes, lights, tyres, OBD diagnostics up to 2019)
Our Warehouse Care advice: if your car is under 6 years old and you carefully check the 8 checklist points above, you can go straight to the test. If it's 6-10 years old, at least get an OBD diagnosis (from €78, vehicles up to 2019) to check no engine fault is lurking. Beyond 10 years, a full service (from €279, pre-inspection included) often pays off.
On the day — 4 habits
- Arrive 10 min early. Centres are strict about appointment times.
- Tank at least ¼ full. The inspector may run the engine and does emissions checks.
- Clean car outside. Not compulsory, but it makes the visual inspection easier.
- Be polite to the inspector. He has some discretion over certain minor faults. A good attitude helps.
If you fail: what to do?
You get a certificate listing the faults and the deadline to come back for the re-test. Depending on how serious they are, the car may still be driven until then or must stay off the road: read carefully what it says.
2 options:
- You do the repairs yourself (if simple: bulb, wiper blade, tyre pressure) then come back for the re-test.
- You go through a professional who does the repairs, then you take your car to the re-test.
In short
- Many fail the first time, most of it avoidable with a 15-minute checklist
- Top reasons for failing: tyres, brake pads, bulbs, exhaust, OBD light on
- Professional prep recommended for cars over 10 years old (home diagnostics from €78, vs €200-400 of urgent repairs if you fail)
- For a recent car, the home checklist and a document check are usually enough
- If you fail, a deadline is set to come back: planning ahead takes the stress away