How to Spot a Bad Used Car Before Buying

Buying a used car can save you money — but it can also cost you thousands if you pick the wrong one. Here are the red flags our RACV-accredited mechanics see most often and the checks you should never skip.

1. Check the Exterior for Damage or Poor Repairs

Look for these signs:

• Misaligned panels or inconsistent gaps
• Paint mismatches, overspray or patchy areas
• Rust on wheel arches, sills or boot
• Dents hidden under stickers or trims
• Windscreen cracks or star chips

2. Inspect the Tyres and Wheels

Warning signs:

• Uneven tyre wear (suspension or alignment issues)
• Different brand tyres on each wheel
• Bald edges or sidewall cracks
• Cheap tyres on a premium or European vehicle

3. Check Under the Bonnet

• Fresh oil leaks or wet areas
• Burnt oil smell
• Contaminated coolant (brown or milky)
• Loose hoses or wiring issues
• Corroded battery terminals

4. Start the Engine and Listen

• Knocking or tapping noises
• Rough idle or hesitation
• Excessive vibration
• Visible smoke from the exhaust
• Warning lights on the dashboard

5. Test All Electronics

• Windows and mirrors
• A/C and heating
• Reverse camera and sensors
• Infotainment and Bluetooth

6. Check for Odometer Tampering

• Worn pedals, steering wheel or seats
• Missing logbook entries
• Very low kms for the age

7. Take the Car for a Proper Test Drive

• Steering vibration
• Brake shudder
• Gearbox jerking or delays
• Clunks over bumps
• Smoke under acceleration

8. Why a Professional Pre-Purchase Inspection Matters

• Hidden leaks and mechanical faults
• Diagnostic trouble codes
• Undercarriage and rust damage
• European-specific faults (turbo, DPF, DSG)

Frequently Asked Questions

How long does an inspection take?

45–90 minutes depending on the vehicle.

Can it find past accident damage?

Yes — structural and cosmetic issues are assessed.

Do I still need an inspection even with good service history?

Yes — many issues go undetected without diagnostics.