The Complete Used Car Buyer's Checklist (Sydney Edition, 2026)

Every week our inspectors are sent to bail buyers out of cars they almost bought. The pattern is always the same: the listing looked clean, the seller was friendly, the test drive felt fine — and three weeks later there's a $4,800 transmission bill, a structural repair stamped on the chassis, or a finance company lodging an encumbrance claim. Almost every one of those losses was preventable by checking forty minutes' worth of items before money changed hands.

This is the same checklist our inspectors run in their head on every job. Print it. Cross things off. If you cannot tick at least 40 of the 47, the car deserves either a sharp price renegotiation or a polite walk-away.

Before you leave the house

Arriving at the car

Get there fifteen minutes early. You want to see the engine stone-cold. A car that has been pre-warmed is hiding either a hard-start issue, a coolant problem, or noisy lifters.

1. 1.Walk a full lap of the car before saying hello. Stand at each corner and crouch — panel gaps should be even (4–5mm) and consistent. A door that protrudes 2mm at the top is a repaired car.
2. 2.Run your palm down each panel. Repaired filler feels colder and slightly slick versus the rest of the body.
3. 3.Open and close every door, the boot, and the bonnet. Resistance, sag, or a door that needs to be lifted into place means hinge wear, accident repair, or a dropped frame.
4. 4.Check the tyre date codes (four-digit code on the sidewall — 3722 = week 37 of 2022). Tyres older than six years are EOL even if tread is fine.
5. 5.Look under the car with a torch. Wet patches, drips, or shiny new sealant in patches that should be old grime are all signs to negotiate or walk.

Cold-start and idle

• Sit in the car and turn the key to position II (not start) — all warning lights should illuminate. If any are missing, a bulb has been pulled to hide a fault.
• Start the engine. You're listening for a clean fire-up, no rattle for the first two seconds, no blue or white smoke from the exhaust.
• Let it idle for two minutes. The idle should settle. A hunting idle (RPM bouncing) on a modern car is rarely innocent.
• Aircon on max cold — should reach vent temperature below 8°C within 90 seconds. Slow cooling = compressor or refrigerant issue.

The 20-minute road test

Drive it like you'll drive it. Five minutes of suburban, five of highway, five of stop-start, and five of parking. You're hunting for:

• Steering wheel that pulls left or right under braking — uneven brake wear or suspension geometry
• Vibration that arrives at 80 km/h and disappears at 110 km/h — wheel balance, but also a sign of an out-of-round tyre
• Hesitation on shift (auto) or graunch (manual) — torque converter or clutch wear
• Cruise control engages and disengages cleanly without a warning light
• Reverse gear engages without a thunk, and reverse camera/sensors work
• All electric windows go down AND up at the same speed

Under the bonnet, after the drive

EV-specific (electric and plug-in hybrid)

• Ask for the most recent battery State of Health (SoH) report. No report = you need a proper test. A 6-year-old EV at 78% SoH is fine; the same car at 65% has had abuse and a $25k battery hides behind it.
• Check charging history if the car supports it (Tesla, BYD, Polestar all log this). 100% of charges on DC fast = battery thermal abuse.
• Look for the 12V auxiliary battery age — EVs murder 12V batteries and a flat one mid-trade leaves you stranded.
• Confirm both the Type 2 AC cable AND the DC mode-3 cable are present. Replacements are $400+ each.

Negotiation and walk-away

Every defect you find is worth roughly two to three times its repair cost off the asking price — because a defect signals other defects you have not yet found, and the seller's pricing already assumed the buyer would miss it.

Hire a professional for anything over $8,000

We're biased, obviously. But the math is hard to argue with: a $249 Sydney mobile pre-purchase inspection finds an average of $1,840 worth of negotiation leverage, plus the peace-of-mind value of knowing nothing is hiding. Even on a clean inspection (about 18% of jobs), the photo report is your insurance policy if anything surfaces inside the seven-day money-back window.