How to pass NCT in Ireland: full checklist 2026
The 50 points the NCT actually fails cars on, the 8 most-common failures, and how to walk into the test already passing.
If you’re reading this with an NCT date circled on the calendar, here’s the short version: most NCT failures are predictable, fixable in an hour, and cost less than re-testing. Below is the actual list of points the test fails cars on — straight from the NCT inspection manual — with what we do at V.T. Motors before each one becomes a problem.
What the NCT actually checks
The Irish National Car Test is a 50-point inspection split across six systems. Most cars fail on one of about a dozen recurring issues — almost always lighting, tyres, brakes, or emissions. The rest of the list (chassis, structural rust, seat belts) almost never fails a normally-maintained car.
The six NCT systems
- Lighting (12 points) — headlight aim & intensity, indicators, brake lights, reverse, number-plate lights, fog lights, hazards, dashboard warning lamps.
- Tyres & wheels (8 points) — tread depth (1.6mm minimum), sidewall damage, matching across an axle, wheel-alignment indicator.
- Brakes (10 points) — pad and disc wear, imbalance left vs right, hand-brake travel and grip, fluid level, ABS warning behaviour.
- Emissions (6 points) — CO & HC measurements (petrol), smoke opacity (diesel), EGR/DPF status, exhaust integrity.
- Steering & suspension (8 points) — shock absorbers, ride height, track-rod ends, ball joints, anti-roll bar links, bushings, steering play.
- Body, seat, mirrors (6 points) — mirror cracking, seat belts and pre-tensioner light, wipers, washer jets, screen condition, visible structural rust.
The eight failures we see most often
Out of the 50 inspection points, eight account for roughly four-fifths of all NCT failures we see. If your car is solid on these eight, the chance of passing first time is high.
- Headlight beam alignment. The single most-failed lighting point. 20-minute beam-setter calibration — €35 with us.
- Tyre tread depth. Below 1.6mm anywhere on the tyre and it’s a fail. Inspectors check the inner edge, where alignment problems wear rubber out first. Pair new tyres with a wheel alignment.
- Brake imbalance. Left-vs-right braking force has to fall within tolerance. Sticking calipers, partially-blocked hoses, or worn pads on one side will fail.
- Smoke opacity (diesel). Most can be fixed with a forced DPF regen, an injector clean, or a turbo seal repair.
- Suspension bushings. Knocking over speed bumps is the early warning sign. NCT testers shake the wheel by hand at full lock — any play and it’s a fail.
- Brake pads. Below the pad warning sensor depth and it’s an automatic fail. Brake pad replacement is €110–€180 with us.
- Number-plate lights. Trivial to fix, very easy to fail on. We replace bulbs free if you’re already in for another service.
- Wiper blade smear. Streaky, juddering, or torn wipers fail. €15–€25 a pair with us.
What to do, in order, before your NCT
- Read this list. Walk around the car. Test all the lights — including reverse and number plate.
- Check the tyre tread on the inner edge with a 20p coin (rim of the coin should not show).
- Open the bonnet, check brake fluid level (between MIN and MAX on the reservoir).
- Test the wipers at full speed against a wet screen — if they smear, replace them.
- If anything is questionable, book a Pre-NCT check — €49 flat, 1-hour slot, all 50 points covered.
What a Pre-NCT actually buys you
A Pre-NCT inspection is the same 50-point check the NCT centre does — but at our workshop, with a printed report. If something would fail, we tell you what it is and quote you to fix it on the spot. No upsell, no diagnostic-fee scam, no “while we have it on the ramp” surprise charges.
The math: NCT re-test fee is around €31.50 if you have to come back. Add a day off work for the re-booking, plus the inconvenience. A €49 Pre-NCT with the failures fixed costs roughly the same and gets you through first time. We do these all day, every day; we know what fails.
Phone V.T. Motors on 01 847 5146 to book a Pre-NCT slot. Same-day availability is usually Monday to Wednesday.