How to Check a Used Car Before Buying: Complete 2026 Guide

Key takeaway: Checking a used car properly before buying can save you thousands. Start with a free online check (MOT history, mileage, reliability), run a £4.99 premium check (stolen, finance, write-off), then inspect the car in person. This guide covers every step.

Step 1: Run a Free Online Check

Before you even go to view a car, check it online. This saves time and money by filtering out problem vehicles before you travel. Use CarCostCheck's free report to see:

• Full MOT history: Every test since 2005, with advisories and failures explained in plain English
• Mileage verification: Checks for clocking by analysing year-on-year mileage patterns
• Reliability score: 0-100 based on the car's actual history
• Running cost estimates: Annual fuel, tax, MOT, and predicted repair costs
• Common faults: Known issues for the make and model
• Red flags: Warnings for structural issues, neglect patterns, and safety concerns

This free check alone can rule out a car before you spend anything. If the reliability score is low, the mileage looks suspicious, or there are serious MOT advisories, move on to the next option.

Step 2: Run the Premium Check (£4.99)

If the free report looks good, add the premium check for £4.99. This verifies:

• The car is not reported stolen
• There is no outstanding finance
• It has not been declared a write-off
• The VIN matches official records
• Number of previous keepers
• Any colour changes

This is particularly important when buying from a private seller, where you have less legal protection than buying from a dealer.

Step 3: Verify the Documents

When you go to view the car, check the paperwork:

• V5C (logbook): Make sure it exists, is an original (not a photocopy), and the details match the car. Check the VIN on the V5C against the car. The V5C should show the seller's name and address at the top.
• MOT certificate: Check the expiry date. Cross-reference with the MOT history from your CarCostCheck report.
• Service history: Stamped service books or invoices. Gaps in servicing may indicate neglect.
• Previous MOT certificates: If available, check the mileage progression matches your report.

Step 4: Physical Inspection

Bodywork

• Walk around the car slowly. Look for mismatched paint, orange peel texture, or overspray on trim
• Check panel gaps. Uneven gaps suggest accident damage or poor repair
• Run your fingers along panel edges. Filler feels different to original metal
• Open all doors, the bonnet, and the boot. Check hinges for paint marks or replaced bolts

Tyres

• Check all four tyres (plus the spare) for legal tread depth (1.6mm minimum, ideally 3mm+)
• Look for uneven wear, which indicates alignment or suspension problems
• Check the tyre brands match in pairs (front pair, rear pair). Mismatched tyres suggest budget maintenance

Interior

• Check for damp or musty smells (flood damage or water leaks)
• Lift the carpet in the boot and footwells. Look for water stains or corrosion
• Test every electrical feature: windows, mirrors, air conditioning, heated seats, infotainment
• Check seat wear matches the mileage. A car claiming 30,000 miles should not have heavily worn seats

Engine

• Check the oil on the dipstick. It should be between the markers and not black/sludgy
• Look for oil leaks around the engine. Check the ground where the car is parked
• Remove the oil filler cap and check for a creamy residue (possible head gasket failure)
• Check coolant level and condition. It should be coloured (green, blue, or pink), not rusty

Step 5: Test Drive

• Drive for at least 15 minutes to get the engine fully warm
• Test brakes from various speeds. Listen for grinding, pulling, or vibration
• Drive over speed bumps. Listen for clunks from the suspension
• Test all gears (including reverse). The gearbox should be smooth with no crunching
• Drive at motorway speeds if possible. Check for vibrations or pulling
• Turn the steering fully left and right at low speed. Listen for clicking (CV joint wear)

Step 6: Professional Inspection (Optional)

For cars over £5,000, consider a professional pre-purchase inspection from the AA, RAC, or an independent mechanic. These cost £100-200 and can reveal hidden issues that a non-expert would miss. They are particularly worthwhile for cars with complex mechanicals (turbocharged, diesel, hybrid, or premium brands).

The Complete Check Comparison

Feature	CarCostCheck Free	CarCostCheck Premium £4.99	Typical Paid Service £19.99
Full MOT history (every test since 2005)	✓	✓	✗
MOT advisories in plain English	✓	✓	✗
Estimated repair costs per advisory	✓	✓	✗
Mileage verification / clocking detection	✓	✓	✓
Reliability score (0-100)	✓	✓	✗
Annual running costs breakdown	✓	✓	✗
Fuel cost calculator	✓	✓	✗
Insurance group estimation	✓	✓	✗
Red flag alerts	✓	✓	✗
Common faults for make/model	✓	✓	✗
Stolen check (PNC)	✗	✓	✓
Outstanding finance check	✗	✓	✓
Write-off check (Cat A/B/N/S)	✗	✓	✓
Previous keeper count	✗	✓	✓
VIN verification	✗	✓	✓
Colour change history	✗	✓	✓
Price	Free	£4.99	£19.99

Frequently Asked Questions

What checks should I do before buying a used car?

Free CarCostCheck report (MOT, mileage, reliability, costs), premium check (£4.99 for stolen, finance, write-off), document verification, physical inspection, test drive, and optionally a professional inspection.

How much does a car check cost?

CarCostCheck's free check covers MOT analysis, mileage, and running costs. The premium check adds stolen, finance, and write-off data for £4.99. Typical alternatives charge £19.99 for less data.

Should I check a car from a dealer?

Yes, always. Not all dealers are thorough with their own checks. Running your own takes minutes and costs nothing with the free CarCostCheck report.

Related reading: Car Check Before Buying: 10 Things to Look For | How to Spot a Clocked Car | Best HPI Check Alternative UK 2026