The $200 that saves you $4,000: pre-purchase inspections, done right

Every verdict on this site describes a model — thousands of cars. The one you're about to buy is a single car with its own history, and the only way to know that history is to put it on a lift. A pre-purchase inspection (PPI) is an hour of a mechanic's time, usually $150–$250, and it is the single highest-return purchase in the entire used-car process.

What a good PPI covers

A competent shop will check compression trends, scan every module for stored codes (not just the check-engine light), inspect for accident repair tells like overspray and non-factory welds, measure brake and tire life, and look for the model's known weak points — the same failure clusters we plot on each car page. Bring the Will It Car page for the model with you and ask them to check the top clusters specifically.

• Full OBD-II scan including pending and history codes
• Leak-down or compression check on higher-mileage engines
• Frame/unibody inspection for accident repair
• Suspension, brakes, tires measured — not eyeballed
• Fluid condition: oil, coolant, transmission (color and smell tell stories)
• Recall completion check against the VIN

How to book one

Any independent shop can do a PPI; dealers can too but you want a shop with no stake in the sale. Call ahead, say "pre-purchase inspection on a [year make model], can you do it today or tomorrow?" Most shops slot them in fast because they're easy money. If the car is far away, mobile inspection services exist in every metro.

When the seller refuses

A private seller who won't let a mechanic see the car has told you everything you need to know. The polite script: "I'm a serious buyer and I'll pay asking price for a clean car — I just need my shop to confirm it's clean. If that's a problem, no hard feelings." Then walk. A dealer who refuses an independent PPI on a used car deserves the same walk, faster.

Reading the report

Nothing on a used car inspection comes back perfect — that's normal. What matters is the split between wear items (brakes, tires, bushings: negotiate the price down by the repair cost) and structural problems (accident repair, rust-through, head gasket seepage on a known-weak engine: walk away). If the inspection turns up a known failure cluster for the model just starting to show, you've either found your negotiating leverage or your exit.