Buying a used car without a proper inspection is one of the most common and expensive mistakes Irish buyers make. This guide covers what to check yourself before paying for a professional inspection — and what a professional inspection should cover that you cannot do alone.
The short answer
Before handing over money for any used car in Ireland: check the NCT status online (30 seconds, free), run a basic history check, inspect the body in bright light, start the engine cold, take a proper test drive, and verify the paperwork matches the car. If everything passes, pay €80–€150 for a qualified mechanic's inspection on a ramp. That inspection has saved Irish buyers thousands. Skipping it rarely does.
Step 1: Check NCT status before you even view the car
Before travelling to view any used car, verify the NCT status at ncts.ie using the registration number. An expired NCT means the car cannot legally be driven on Irish roads — and it also signals that the car may have been parked up or neglected. It takes 30 seconds. If the NCT is due soon (within 3–6 months), factor in the cost of the test (€55) and any potential repair costs for items that might fail.
You can also check when the next NCT is due — a car with 18+ months of NCT remaining is meaningfully more convenient than one that's about to expire.
Step 2: Run a car history check
A history check tells you whether the car has outstanding finance against it (which could mean the lender has a legal charge over the car, even after you buy it), has been written off, has been reported stolen, or has a mileage discrepancy. Two commonly used services in Ireland are:
- Cartell.ie — Irish market-specific. Checks finance, insurance write-offs, taxi/hire history, mileage history, and NCT records. Around €14–€29 per check.
- Motorcheck.ie — Similar scope. Around €20 per full check.
If a seller objects to you running a history check, walk away. A seller with nothing to hide has no reason to object.
Step 3: Check the exterior in good light
View the car in daylight, ideally on a flat dry surface. Walk around all four sides and look for:
- Panel gaps: Stand back and look at the gaps between panels (doors, wings, bonnet, boot). Uneven or mismatched gaps indicate a panel has been replaced after a collision.
- Paint colour matching: Look along the side of the car in raking light. Different shades or textures on adjacent panels indicate a respray, which can mean hidden accident damage.
- Rust: Check wheel arches (especially rear, on older cars), lower door edges, sills, and the underside of the boot floor. Irish road salt accelerates corrosion — coastal county cars are highest risk.
- Stone chips and cracks: The bonnet leading edge will always have some chips — this is normal wear. Cracks in the windscreen need replacement before NCT.
- Tyre condition: Check tread depth across the full width of each tyre. Wear on one edge only indicates a wheel alignment problem. Check tyre age — the DOT code on the sidewall ends with the week and year of manufacture (e.g. "2421" = week 24 of 2021). Tyres over 6 years old should be replaced regardless of tread depth.
Step 4: Check the interior
- Mileage on the odometer: Does it match the stated mileage and the service history? High-mileage cars with suspiciously little wear on the pedal rubbers, steering wheel, or seat bolster are a warning sign.
- Smell: Musty or damp smell indicates water ingress — a sunroof drain blockage, windscreen seal failure, or flood damage. This is serious and difficult to fully remediate.
- Warning lights: Turn the ignition to position 2 (dashboard on, engine off) — all warning lights should illuminate briefly then extinguish. Any light that stays on when the engine is running requires diagnosis.
- Electric windows, central locking, mirrors: Test every switch. Faulty window regulators are a common MOT/NCT failure and can cost €150–€300 per door.
- Air conditioning: Test it on a warm setting. It should produce cold air within 1–2 minutes. Air con regassing costs €60–€100 if it's low on refrigerant.
Step 5: Check under the bonnet
You do not need to be a mechanic to do this. Check:
- Oil level and condition: Pull the dipstick. Oil should be between the MIN and MAX marks. Black sludgy oil indicates infrequent oil changes. Oil that looks milky or has a cream-coloured residue under the filler cap suggests a head gasket issue — walk away.
- Coolant level and colour: The coolant reservoir is usually a translucent plastic bottle — level should be between MIN and MAX. Coolant should be coloured (green, blue, or pink depending on type). Brown or rusty coolant means neglected servicing.
- Visible leaks: Any oil or fluid on the engine bay floor or on the underside of the engine should be questioned.
- Battery condition: Swollen or corroded battery terminals suggest a battery that needs replacement soon (typically €80–€150).
Step 6: Start the engine cold
If possible, ask the seller not to start the car before your visit — you want to see it start from cold. Many faults (timing chain rattle, oil pressure issues, misfires) are most obvious in the first 30 seconds of a cold start.
- Listen for any rattles, tapping, or knocking in the first 10 seconds — then they should settle. Persistent rattle from the top of the engine on a petrol car suggests timing chain wear.
- White smoke from the exhaust on a cold start is normal condensation — it should clear within 1–2 minutes. White smoke that persists after warm-up indicates a coolant leak or head gasket issue.
- Blue smoke indicates oil burning — a worn engine.
- Black smoke on a diesel indicates over-fuelling, usually caused by EGR or injector issues.
Step 7: Take a thorough test drive
A 5-minute drive around the block tells you almost nothing. A proper test drive covers:
- Cold behaviour: How does the car behave for the first 2–3 minutes before it reaches operating temperature?
- Gear changes (manual): All gears should engage cleanly. Crunching into 2nd gear is a classic worn synchromesh symptom.
- Automatic or DSG: Test at walking pace in traffic. Judder, hesitation, or harshness at low speeds and from standstill is a warning sign.
- Braking: At 50 km/h on a quiet road, brake firmly. The car should stop straight — pulling to one side indicates a sticking caliper or uneven brake pads.
- Steering: Any vibration through the steering wheel at motorway speed indicates wheel balance issues or worn steering components.
- Suspension: Drive slowly over a speed bump. Any clunking or banging indicates worn shock absorbers or suspension bushings.
- Motorway speeds: If possible, test the car at 100–120 km/h. Stability issues, pulling, or vibrations that do not appear in town are sometimes only detectable at speed.
Step 8: Check the service history and paperwork
- Service book or stamps: A full dealer service history is ideal. Independent garage stamps with receipts are also fine. Gaps in service history — especially around high-risk service intervals (timing belt, coolant change, brake fluid) — should prompt questions.
- V5C log book (UK imports) or Irish registration cert: The VIN (chassis number) on the dashboard and door jamb should match the paperwork exactly. Any discrepancy is a serious red flag.
- NCT certificate: Matches the car and registration?
- Number of previous owners: More owners are not necessarily bad, but each handover is a period of uncertainty about care. A one-owner car with full history from a dealer is the cleanest scenario.
Step 9: Commission a professional pre-purchase inspection
If the car passes your basic checks, pay for a professional inspection before completing any purchase. An independent mechanic or AA/RAC-certified inspection (€80–€150) puts the car on a ramp, checks:
- Undercarriage condition — rust, corrosion, leaks
- Suspension and steering components (bush wear, shock absorbers, ball joints)
- Brake condition and rotor thickness
- Exhaust system integrity
- Oil and fluid leaks from above and below
- Engine diagnostic readout (fault codes)
The inspection cost is trivial compared to the cost of a major repair that the inspection would have identified. Any seller who refuses to allow an independent inspection is a seller to walk away from.
Step 10: Negotiate using what you found
Use any issues discovered during your inspection to negotiate the price. Items that do not affect safety or reliability immediately (cosmetic stone chips, worn tyres, a cracked rear reflector) are legitimate negotiation points. Issues flagged by the mechanic (worn brake pads, a service overdue, a non-critical fault code) give you leverage for a price reduction or a commitment from the seller to fix the issue before sale.
A genuine seller will engage with reasonable negotiation. A seller who refuses to negotiate despite documented issues is a seller worth leaving behind.
Common pre-purchase inspection failures in Ireland
These are the items most commonly identified during pre-purchase inspections on used cars in Ireland, based on mechanic feedback and owner-forum data:
- Worn brake pads or discs (especially rear)
- Suspension bushing wear (front lower arm, rear trailing arm)
- Timing belt or chain service overdue
- Engine Management Light codes (often masked before sale)
- DPF issues on short-trip diesel cars
- Exhaust system corrosion (Irish road salt accelerates this)
- Windscreen chips in the driver's view (NCT failure)
- Tyre age or uneven wear
Model-specific buying guides
Autoza's model-specific common-faults guides cover the most popular used cars in Ireland with year-by-year fault patterns, what to check on inspection, best and worst years to buy, and Irish repair cost estimates. We have guides for the VW Golf, Toyota Corolla, Hyundai Tucson, Nissan Qashqai, Skoda Octavia, Ford Focus, Dacia Duster, Renault Clio, SEAT Leon, and more. Browse them at autoza.ie/guides.
