What to check on a used car viewing before you start the engine

Seeing a used car in person gives you the chance to spot problems that photographs and listings can hide. A systematic visual inspection before you even turn the key helps you avoid costly surprises and gives you confidence before you negotiate.

1. Verify the paperwork first

Ask to see the V5C (logbook) and the most recent MOT certificate. The V5C tells you who the registered keeper is, but it is not proof of legal ownership. Check that the registration number on the V5C matches the plates on the car.

• VIN check: The vehicle identification number is stamped on the chassis or body, usually visible through the windscreen. It should match the VIN recorded on the V5C and any service book you are shown.
• MOT history: Use the registration number on GOV.UK to view the free MOT record. Look for repeated failures or a very recent pass that might hide a problem.
• Service records: A full service book that lines up with the odometer reading is a positive sign, but gaps do not automatically mean the car has been tampered with.

If any document looks altered or the seller cannot produce the V5C, treat the purchase as high risk.

2. Walk the exterior

Stand back and view the car from several angles. You are looking for evidence of accidents, poor repairs or neglect.

• Check paint colour consistency across panels; mismatched shades can indicate a repair.
• Look for uneven panel gaps, fresh filler or sanding marks.
• Inspect wheel arches, door sills and the boot lid for rust or corrosion.
• Examine the windscreen and windows for chips, cracks or signs of replacement.
• Confirm the VIN you saw earlier is still legible and matches the paperwork.

3. Inspect the interior

The cabin can reveal both normal wear and hidden issues.

• Check upholstery for tears, stains or uneven wear that might suggest higher mileage than shown.
• Operate all switches, lights, wipers and the infotainment system; non‑functioning items may hint at electrical faults.
• Read the odometer and compare the figure with the mileage recorded in the service book and MOT history. Large discrepancies could indicate mileage clipping.
• Open the boot and look for water ingress, rust, or a spare tyre whose tread is below the legal 1.6mm depth.

4. Look under the bonnet without starting the engine

You can spot many potential problems without firing up the car.

• Check the oil level and colour; low or milky oil can signal leaks or coolant mixing.
• Inspect the coolant reservoir for correct level and any oily film on the surface.
• Examine drive belts for cracks, fraying or excessive wear.
• Look at battery terminals for corrosion and ensure the battery is securely mounted.
• Notice any strong smells of petrol, oil or coolant – these can hint at leaks.

If you see fluid puddles on the ground after the car has been parked, ask the seller to explain before proceeding.

5. Tyres, wheels and brakes

Tyres are a cheap, visible safety indicator, and brakes are essential for safe stopping.

• Measure tread depth with a simple gauge or the "penny test" – the legal minimum is 1.6mm across the central three‑quarters of the tread.
• Look for uneven wear, which can point to suspension problems or mis‑alignment.
• Inspect sidewalls for cuts, bulges or cracks.
• Through the wheel rims, check the brake discs for deep scoring or uneven thickness.

6. Final quick‑check before you decide

Run through a short checklist to be sure you haven’t missed anything important.

1. Paperwork matches the car (V5C, MOT, VIN, service records).
2. Exterior shows no hidden damage, rust or mismatched paint.
3. Interior is free of excessive wear and all electronics work.
4. Tyres meet the legal 1.6mm tread depth and are evenly worn.
5. No fluid leaks, corrosion or strong odours under the bonnet.
6. Vehicle tax has not been transferred – you will need to tax the car yourself before driving.

If any item raises doubt, consider asking for a professional inspection or walking away. A careful visual inspection before you even turn the key is your first line of defence against costly surprises.

Takeaway

By following a structured viewing routine – paperwork, exterior, interior, engine bay, tyres and a final checklist – you can spot most serious issues before committing to a purchase. Use the flags graphic to remember good signs and red flags, and the myths graphic to debunk common misconceptions. A thorough check gives you confidence, whether you’re buying through Browse Cars or any other private sale.