Written and reviewed by the Finance Director at Car Buyers Assist
Buying a used car can save you thousands, but only if you know what you’re looking at. A tidy detail job and a fresh set of floor mats can hide a tired engine, accident repairs or money still owing to a lender. The good news: with a methodical approach, most problems reveal themselves before you hand over a cent.
This guide walks you through exactly how to inspect a used car before buying, from the kerbside walk-around to the test drive and the all-important paperwork checks. Work through it like a checklist, take your time, and don’t be afraid to walk away.
Before You Go: Set Yourself Up to Win
A good inspection starts before you arrive. Get these basics right and you’ll spot issues a rushed buyer would miss.
- Inspect in daylight, on a dry day. Rain, darkness and shadowy carports hide dents, paint mismatches and leaks. Reschedule if the weather’s against you.
- See the car at the seller’s home address (for private sales) and check it matches the registration papers.
- Bring a checklist, a torch, your phone and a friend. A second set of eyes keeps you honest and the seller relaxed.
- Ask the car to be cold. A pre-warmed engine can mask hard cold-starting problems. Ask the seller not to run it before you arrive.
- Have the basics ready: the registration number, the seller’s name, and a notepad to record the VIN and odometer reading.
Exterior: Panels, Paint, Rust and Tyres
Walk slowly around the car twice. Crouch at each corner and sight down the panels.
- Panel gaps and alignment. Uneven gaps between doors, bonnet and boot often signal past accident repairs. Gaps should be even and consistent on both sides.
- Paint consistency. Look for colour mismatches, overspray on rubber seals, or a slightly different texture (orange peel) on one panel. These point to resprays.
- Rust. Check wheel arches, sills, door bottoms, the boot floor (lift the spare) and around the windscreen. Bubbling paint is rust working its way out.
- Tyres. All four should match and wear evenly. Uneven wear suggests alignment, suspension or chassis issues. Check the tread depth and the date code, and don’t forget the spare.
- Lights and glass. Test every light. Look for chips or cracks in the windscreen that could fail a roadworthy.
- Underneath. Where safe, glance under the car for fresh oil, fluid drips or crash damage.
Interior: Wear, Electronics, Smells and Warning Lights
The cabin tells you how the car was treated and whether the odometer is believable.
- Wear vs odometer. A worn steering wheel, shiny seat bolsters and a polished gear knob on a “low-kilometre” car is a red flag for a wound-back odometer.
- Electronics. Test the windows, central locking, air-conditioning (it should blow cold quickly), heater, infotainment, reversing camera and all seat adjustments.
- Smells. A damp or musty smell can mean water leaks or past flood damage. An overpowering air freshener may be masking something.
- Warning lights. Turn the ignition to “on” before starting. The dash lights should illuminate and then clear once running. A light that never comes on may have been removed to hide a fault.
- Seatbelts and airbags. Check belts retract properly and the airbag warning light behaves normally.
Under the Bonnet: How to Inspect a Used Car Engine
You don’t need to be a mechanic to learn a lot here. Inspect the engine cold, before any test drive.
- Oil. Pull the dipstick. Healthy oil is honey to light brown. A milky, mayonnaise-like film under the oil cap can indicate a head gasket problem.
- Coolant. Check the level in the overflow bottle and the colour. Rusty or oily coolant is a warning sign. Never open a hot radiator cap.
- Leaks. Look for oil, coolant or fuel weeping from the engine, hoses and around the sump.
- Belts and hoses. Belts shouldn’t be cracked or frayed; hoses shouldn’t be soft, bulging or perished.
- Battery and terminals. Check for corrosion and that the battery is secured.
- The cold start. Now start it. Listen for a clean start with no rattles, knocking or excessive smoke. Blue smoke suggests oil burning; white smoke that doesn’t clear can mean coolant in the cylinders.
The Test Drive: What to Feel, Hear and Watch
A proper test drive is non-negotiable. Aim for at least 15 minutes over a mix of suburban streets, hills and, if possible, some highway speed.
- Cold start first. Note how it fires up and idles when cold.
- Brakes. They should stop straight and firm with no pulsing, grabbing or pulling to one side. A squeal or grind means pad or rotor wear.
- Steering. It should track straight on a level road with no vibration through the wheel. Knocks over bumps can mean worn suspension.
- Gears. Manuals should shift cleanly with a clutch that bites in the middle of its travel. Autos should change smoothly without jerking, slipping or flaring revs.
- Noises. Turn the radio off. Listen for whines, clunks, droning wheel bearings or exhaust blow.
- Power and temperature. It should pull cleanly under acceleration and the temperature gauge should sit steady in the normal range.
Paperwork and History: The Checks That Protect Your Wallet
This is where many Australian buyers come unstuck. A car can drive beautifully and still be a financial trap.
- PPSR check. Before you buy, run a PPSR (Personal Property Securities Register) search using the VIN. For an indicative fee of around $2, it tells you whether there’s money owing on the car, whether it’s been written off, and whether it’s been reported stolen. If there’s finance owing and you buy it, the financier can repossess the car even after you’ve paid the seller. This single check is the most important one in this guide.
- VIN and engine number match. Confirm the VIN on the car (windscreen base, door jamb, engine bay) matches the registration papers and the PPSR result.
- Service history. A complete logbook with regular stamps is gold. Cross-check the dates and kilometres against the odometer for consistency.
- Registration. Check the rego is current and note the expiry. In most states a roadworthy or safety certificate is required to transfer.
- Seller ID. For private sales, confirm the seller’s name and address match the registration. Be wary of anyone selling on behalf of an absent “owner”.
When to Get a Professional Pre-Purchase Inspection (and What It Costs)
A DIY inspection filters out the obvious duds. For anything you’re serious about, a professional pre-purchase inspection is cheap insurance against an expensive mistake. A qualified mechanic will put the car on a hoist, scan for fault codes, and assess components you simply can’t see from the kerb.
So, how much does a mechanic charge to inspect a used car? As an indicative guide, expect to pay roughly $150 to $300 in Australia, depending on the depth of the inspection and your location. Mobile services that come to the seller are popular and sit within a similar band. Compare that with the cost of replacing a transmission, and it’s money very well spent.
To get a used car inspected before buying, you can book an independent mechanic, an automotive club inspection service, or a mobile inspector. Always use a qualified, independent party, never the seller’s “mate”.
As a buyer’s agent, this is exactly the kind of legwork we handle for clients. Car Buyers Assist can source, inspect and negotiate on your behalf, so you don’t have to chase listings or stand in a stranger’s driveway. Learn more about how we buy a car for our clients. If you’re weighing up your options, our guides on how to negotiate a car price and car broker vs dealer are useful next reads.
Red Flags: When to Walk Away
Trust your instincts. Any of these should give you serious pause:
- Money owing on the PPSR, or a write-off / stolen result.
- A VIN that doesn’t match the papers or shows signs of tampering.
- A seller who won’t allow an independent inspection or a proper test drive.
- A price that’s too good to be true, or pressure to pay a deposit immediately.
- No service history and vague answers about the car’s past.
- Mismatched odometer and wear, fresh overspray, or a musty, damp interior.
- A warm engine on arrival when you asked for it cold.
There are always other cars. Walking away costs you nothing; ignoring a red flag can cost you thousands.
Frequently Asked Questions
How do you inspect a used car before buying?
Inspect in daylight on a dry day with the engine cold. Work through the exterior (panels, paint, rust, tyres), the interior (wear, electronics, warning lights), under the bonnet (oil, coolant, leaks), then a 15-minute test drive. Finish with a PPSR check and service history review before agreeing on a price.
How much does a mechanic charge to inspect a used car?
In Australia, a professional pre-purchase inspection typically costs around $150 to $300, depending on the depth of the inspection and your location. This is indicative only. Mobile inspectors who come to the car sit in a similar range. Given it can uncover faults worth thousands, it’s well worth the spend on any serious purchase.
What should I check when inspecting a used car?
Check panel gaps and paint for accident repairs, rust in wheel arches and sills, even tyre wear, and all electronics and warning lights inside. Under the bonnet, check oil, coolant and leaks. On the road, test brakes, steering, gears and listen for noises. Then run a PPSR check and review the service history.
How do I inspect a used car engine?
Inspect the engine cold. Check the oil colour on the dipstick and look for a milky film under the oil cap. Check coolant level and colour, and look for oil, coolant or fuel leaks around hoses and the sump. Then start it: listen for rattles or knocking and watch for blue or white smoke from the exhaust.
Should I get a pre-purchase inspection?
Yes, for any car you’re serious about. A DIY check catches obvious issues, but a qualified, independent mechanic can hoist the car, scan for fault codes and assess hidden components. At an indicative $150 to $300, it’s cheap insurance against an expensive surprise like a failing gearbox or hidden accident damage.
How do I check if a used car has money owing on it?
Run a PPSR (Personal Property Securities Register) check using the car’s VIN at ppsr.gov.au. For an indicative fee of around $2, it confirms whether there’s finance owing, whether the car has been written off, and whether it’s been reported stolen. If money is owing and you buy it, the financier can repossess the car, so always check first.
What are the red flags when buying a used car?
Walk away if the PPSR shows money owing, a write-off or stolen status; if the VIN doesn’t match the papers; or if the seller refuses an independent inspection or test drive. Other warning signs include mismatched odometer and interior wear, fresh overspray, a musty cabin, no service history and high-pressure sales tactics.
This article is general information only and does not constitute credit or financial advice. It does not take into account your personal objectives, financial situation or needs. Consider whether the information is appropriate for you and seek professional advice before acting. Car Buyers Assist operates under Australian Credit Licence 506065 (Five Tees Pty Ltd). Lending is subject to approval, lending criteria, terms, conditions and fees.