Pre-Purchase Car Inspection (PPI): Cost, What’s Checked and How to Get One
A pre-purchase inspection (PPI) costs about $100–$250 at an independent shop. What the mechanic checks, how to book one, mobile vs shop, EV battery checks, and the red flags that should end the deal.
Still stuck after this guide? You can ask a mechanic online — see pricing, expert credentials and common questions first.
What Is a Pre-Purchase Inspection (PPI)?
A pre-purchase inspection (PPI) is a paid check of a used car by an independent mechanic before you buy it. The mechanic works for you, not the seller. You get a written report on the car’s mechanical, safety and body condition, plus any problems the seller did not mention. "PPI" is simply the short name buyers, dealers and forums use for it.
A PPI is not the same as a state safety or emissions inspection. Those check minimum legal compliance on the day of the test. A PPI looks at condition and upcoming costs: brakes, tires, leaks, stored fault codes and signs of past accident or flood damage.
How Much Does a Pre-Purchase Inspection Cost?
Most buyers pay $100 to $250 for a pre-purchase inspection at an independent repair shop. Consumer Reports puts a typical mechanic’s fee at $100–$150 (as cited by Progressive), and Capital One cites $100–$200, with sports and classic cars costing more. National mobile services that send an inspector to the seller charge more, because travel and a photo report are built into the price.
| Where you get it | Typical price | What to know |
|---|---|---|
| Independent repair shop | $100–$250 | Usually includes a lift, scan tool and road test. You or the seller bring the car in. |
| Brand dealership service department (not the selling dealer) | Varies; ask for a quote | Useful for brand-specific systems and known weak points. |
| Mobile inspection: standard car | About $220–$250 | Inspector goes to the car. Written report with photos. |
| Mobile inspection: classic, exotic or luxury | About $286–$499 | Specialist checks cost more. |
| Commercial vehicle or RV | About $365–$449 | Covers work equipment, or RV water, LP gas and slide-outs. |
Published national mobile-service prices as of October 2026; confirm when you book. The buyer normally pays. If the car has a problem the seller hid, it is reasonable to ask them to cover the inspection in your final price. For other repair prices, see our car repair cost guide.
How to Get a Pre-Purchase Inspection
- Pick an inspector who does not work for the seller. Good options are an ASE-certified independent shop, a shop in the AAA Approved Auto Repair network, a specialist for the brand, or a national mobile inspection service.
- Tell the seller up front. Make your offer "subject to a satisfactory inspection by a mechanic of my choice." Dealers and most private sellers are used to this.
- Book a time that suits both sides. At a shop, the seller or you drive the car in. A mobile inspector meets the car where it is, usually within one to two business days.
- Tell the mechanic what you know. Give the year, make, model and mileage, and ask about known weak points for that model. If anything already worries you (a noise, a warning light), mention it. Our car symptom guide helps you describe it.
- Get the report in writing. Ask for an emailed report with photos and repair estimates. You will use it to negotiate or walk away.
- Check the quotes. If the report lists repairs, compare the estimates with our mechanic quote checker before you set your counteroffer.
What a Pre-Purchase Inspection Includes
A thorough shop PPI takes about 60–90 minutes and should cover:
- Scan tool check for stored and recently cleared fault codes (see common check engine codes)
- Road test: engine, transmission shifting, steering, brakes and suspension noises
- Lift inspection of the underside: frame rails, rust, exhaust, leaks (oil, coolant, transmission, differential)
- Brakes: pad thickness and rotor condition (vibration when stopping is covered in brake pulsation)
- Tires: tread depth and uneven wear on all four
- Fluids: level and condition of oil, coolant, brake and transmission fluid
- Body: panel gaps, paint mismatch and repair filler that point to past accidents; signs of flood damage
- Electrics and comfort: lights, windows, A/C and heat, infotainment
- Written report with photos and estimated repair costs
Often not included unless you ask: compression or leak-down tests (worth adding on high-mileage or performance engines), a check for open recalls, and an EV battery health report. Mobile inspectors usually do not have a lift; YourMechanic, for example, states its mobile PPI uses floor jacks and does not include a compression test.
Mobile vs Shop Inspection: Which to Choose
| Shop PPI | Mobile PPI | |
|---|---|---|
| Typical price | $100–$250 | About $220–$250 standard; more for classic, exotic, RV |
| Lift and underside view | Yes | Usually no (jacks or a crawl-under) |
| Extra tests (compression, smoke test) | Easy to add | Limited |
| Car has to move | Yes, seller must agree | No, the inspector goes to the car |
| Best for | Local cars, high-mileage engines | Out-of-town or online purchases, sellers who won’t let the car leave |
If the car is local and the seller agrees, a shop inspection usually gives you more for less money. If you are buying from another city, a mobile inspection is often the only practical option.
Inspecting a Used EV or Hybrid
On an electric car, the high-voltage battery is the most expensive part, and a general PPI may only confirm that it charges. Ask the inspector for a battery state-of-health (SOH) reading from a diagnostic tool, or ask the seller for a battery health report. Charge to full and compare the displayed range with the original rated range. Check the charge port and, if you can, both AC and DC fast charging. Ask for the remaining battery warranty in writing, including whether it transfers to you. On hybrids, also check the 12-volt battery, the hybrid battery cooling fan and filter, and for any stored hybrid-system codes.
When a Seller Refuses an Inspection
No law requires a private seller or dealer to allow an independent inspection. The Federal Trade Commission’s used-car guidance recommends an independent inspection even on a dealer-certified car, and says that if a dealer won’t allow one, consider going to another dealer. Treat a flat refusal, or a seller who insists on using "their" mechanic, as a red flag.
Reasonable compromises: a mobile inspector who comes to the seller’s location, a refundable deposit while the car is inspected, or the seller driving the car to your shop themselves. Some large retailers offer a short money-back window. If you buy there, book a PPI inside that window, and confirm the current return terms in writing before you sign.
Red Flags That Should Kill the Deal
Frame damage from a previous accident (PPI mechanic checks frame rails for repair welds, bondo, mismatched paint depth). Active major fluid leaks — engine oil, transmission fluid, or coolant. Compression test variation greater than 10% across cylinders (suggests a worn engine). Transmission slipping under load on the test drive. Salvage or rebuilt title not previously disclosed. Major rust on frame, suspension components, or floor pans. Modifications by previous owners that affect emissions, suspension, or drivetrain (lifted trucks, intake/exhaust on naturally aspirated cars). For any of these, walk away — the price reduction needed to make it worthwhile is usually more than the seller will accept. Signs of flood damage: silt or a musty smell under the carpets, or corrosion on seat rails and under the dash.
Negotiable Findings That Are Useful Leverage
Worn brake pads (3mm or less) — $200-$500 to replace at a shop. Aging tires (under 4/32" tread or sidewall cracking) — $400-$1,000 for new tires. Worn but functional shocks/struts — $400-$800 per pair installed. Upcoming timing belt service (specific to vehicles with rubber timing belts) — $600-$1,200 if not done. Battery age over 4 years — $150-$300. Add up the dollar amounts of all items needing attention in the next 12 months, then negotiate that amount off the asking price. A seller motivated to sell will usually meet you halfway.
Tools and Records to Demand With the Car
Most recent two oil change records (proves regular maintenance). Service history for any timing belt, transmission service, or major repairs in the last 50,000 miles. Both keys (replacement keys cost $200-$600 from dealers). Owner manual and any aftermarket equipment manuals. CARFAX or AutoCheck history report — most legitimate sellers provide one for free. If the seller refuses any of these, factor it into your offer or pass. Open recalls checked by VIN at nhtsa.gov/recalls.
Pro Tips
Frequently Asked Questions
What does PPI mean when buying a car?
PPI stands for pre-purchase inspection: a paid, independent check of a used car by a mechanic you choose, done before you agree to buy. You get a written report on the car’s condition and any repairs it needs.
How much is a PPI?
Usually $100–$250 at an independent repair shop. Mobile services that come to the car publish prices of about $220–$250 for a standard car, and roughly $286–$499 for classic, exotic, luxury or commercial vehicles. The buyer normally pays.
How do I get a pre-purchase inspection?
Choose an independent shop or mobile inspector that has no link to the seller. Make your offer subject to the inspection, agree a time with the seller, and either have the car brought to the shop or have a mobile inspector go to it. Ask for a written report with photos.
Does the dealer have to allow a pre-purchase inspection?
No law requires it, but most reputable dealers allow one, sometimes with a salesperson along or with the car staying on their lot for a mobile inspector. The FTC advises considering another dealer if one refuses an independent inspection.
How long does a pre-purchase inspection take?
The inspection itself takes about an hour to an hour and a half. Booking a mobile inspector can take one to two business days, and some services send the report the morning after the visit.
Do mechanics charge to look at a car you are thinking of buying?
Yes. A pre-purchase inspection is a paid service with a set fee, usually quoted before the work starts. Ask the shop what is included, such as the road test, lift inspection, code scan and written report, so you can compare quotes.
What if the inspection finds problems but I still want the car?
Use the report to negotiate. Add up the repair estimates for anything needed in the next 12 months and ask for that amount off the price. If the seller will not move and the gap is large, the car is overpriced for its condition.
