# What a Pre-Purchase Inspection Should Document > The checklist, underbody photos, module scan, road test, second sign-off and buy-or-walk letter a used car inspection should hand you, and what it cannot see. Source: https://route66autorepairshop.com/blog/what-a-pre-purchase-inspection-should-document Updated: 2026-09-17 Business: Route 66 Auto Repair, 1775 W Foothill Blvd, Upland, CA 91786, (909) 608-7699 Hours: Monday to Friday 8 AM–5 PM, Saturday 8 AM–2 PM, Sunday closed **TLDR:** A real PPI hands you **documented evidence**: photos, a **full-module scan**, a road test and a signed **buy-or-walk letter**. An empty box is not a deluxe inspection. A pre-purchase inspection should leave you with proof, not a verbal thumbs-up: a completed checklist, underbody photos, a full-module scan, a road test, a second sign-off and a written buy-or-walk letter. Route 66 Auto Repair in Upland offers one inspection, the Deluxe PPI, and every box gets filled. ## Why does the paperwork matter more than the opinion? Buying a used car is stressful. The seller is friendly, the price looks fair, and you have maybe an hour to decide. A mechanic who walks around the car and says it looks fine has not given you much to work with. You cannot show that to the seller, you cannot compare it with another car, and you cannot check it later when something goes wrong. Documents change that. A photo of a wet oil pan is hard to argue with. A scan report listing stored codes in the transmission or airbag module tells you something the dashboard did not. A written letter that says buy, buy with conditions, or walk gives you a clear answer you can act on, and a list of reasons you can take back to the seller. That is why our [pre-purchase vehicle inspection](https://route66autorepairshop.com/diagnostics-and-inspections/pre-purchase-vehicle-inspection) is built around what it hands you, not just what the technician looks at. ## What does the Deluxe PPI include? There is one inspection here, the Deluxe PPI. It has six parts, and each one produces something you can hold. An empty box is not a deluxe inspection. If any part cannot be completed, for example because the seller will not allow a road test, the letter says so plainly. - A printed checklist covering the engine, transmission, brakes, tires, suspension, steering, cooling, electrical, body and interior - Underbody photos of the frame, any leaks, the splash shrouds and the rubber boots on axles and steering - A full-module scan that reads every computer the scan tool can reach, not only the engine - A road test that covers cold start, idle, acceleration, braking, turning and highway-speed behavior - A second sign-off by another technician or service writer who reviews the findings - A written buy-or-walk letter that summarizes the findings and gives a clear recommendation ## What should the underbody photos show? Most of the expensive surprises on a used car live underneath it. With the car on a lift, the technician photographs the areas that tell the real story. The frame and subframe come first. Kinks, fresh welds, heavy undercoating in one spot, or clamp marks can point to past crash damage. When something looks off, a closer [frame damage inspection](https://route66autorepairshop.com/diagnostics-and-inspections/frame-damage-inspection) may be worth adding before you commit. Leaks are next. Oil, transmission fluid, coolant, power steering fluid and brake fluid each leave a different trace. A photo shows where the wet spot is and how fresh it looks, which matters more than a note that says minor seepage. Shrouds and splash shields show whether the car has scraped hard, been worked on, or is missing parts that keep water and debris off the engine. Missing fasteners and zip ties are worth a picture. Boots are the rubber covers on CV axles, steering racks and ball joints. A torn boot lets grit in and grease out, and the part behind it wears quickly. They are cheap to photograph and easy to miss from the top. ## How is a pre-purchase inspection run, step by step? The order matters, because some problems only show on a cold engine and some only show after a drive. 1. **Intake and paperwork:** We record the VIN, mileage and what you know about the car. We also suggest you run the VIN through the NHTSA recall lookup before the visit. 2. **Cold start:** Where the seller allows it, the car is started cold. Rough starts, smoke, rattles and warning lights are noted before the engine warms up and hides them. 3. **Full-module scan:** The [vehicle diagnostic scan](https://route66autorepairshop.com/diagnostics-and-inspections/vehicle-diagnostic-scan) reads stored and pending codes from every reachable module. Recently cleared codes and incomplete readiness monitors are flagged. 4. **Checklist walk-through:** The technician works through the printed checklist: fluids, belts, hoses, brakes, tires, lights, body panels, glass and interior functions. 5. **Lift and photos:** The car goes up for underbody photos of the frame, leaks, shrouds and boots, plus suspension and exhaust condition. 6. **Road test:** A drive on surface streets and, where practical, the freeway checks shifting, braking, steering, noises and how the car tracks. 7. **Second sign-off:** Another technician or the service writer reviews the checklist, photos and scan, and asks questions before anything is written up. 8. **Buy-or-walk letter:** You get a written summary with a recommendation and the reasons behind it, along with the photos and the scan report. ## What can a pre-purchase inspection not promise? An honest inspection tells you its limits. Ours cannot promise that nothing will fail after you buy the car. Parts that test fine today can fail next month, and no one can predict that with certainty. It also cannot see inside sealed components without taking them apart. The inside of an engine, a transmission, a differential or a sealed electronic module is judged from outside signs: codes, fluid condition, noises, leaks and how the part behaves on the road. When those signs raise a question, the letter says so and suggests a deeper test, such as a [transmission condition inspection](https://route66autorepairshop.com/diagnostics-and-inspections/transmission-condition-inspection), before you buy. Other limits worth knowing: the inspection does not verify title history, ownership, or odometer records, and it cannot catch a problem that only appears under conditions the road test did not reach, such as a long climb on a hot afternoon. For hybrids, tell us at intake and we will explain what we can take on. ## How should you read the buy-or-walk letter? The letter sorts what was found by how much it should affect your decision. This table shows the kinds of findings that usually land in each group. | Recommendation | Typical findings | What to do | | --- | --- | --- | | Buy | Normal wear, routine maintenance coming due, no active faults | Plan the maintenance and budget for it | | Buy with conditions | Worn brakes or tires, a small leak, an old battery | Ask the seller to fix it or adjust the price | | Get a deeper test first | Codes in a major module, harsh shifts, signs of overheating | Hold the deal until the test is done | | Walk | Frame damage, major leaks, cleared codes hiding faults, failed safety systems | Keep looking, and keep the report | ## Which findings are need-now, and which can wait? If you buy the car, the report doubles as your first repair plan. Each finding is labeled so you know what to do before driving it home and what can be scheduled. **Need now:** - Brake, steering or tire problems that affect safety - Active fluid leaks near hot exhaust parts - Airbag or ABS (anti-lock brake system) warning codes - Signs of overheating or low oil pressure **Need later:** - Torn boots with the joint still tight - Light seepage from a gasket - Maintenance due within the next few months - Cosmetic body and interior wear ## How do you set up an inspection with a private seller or a dealer? Ask the seller early whether they will let the car be inspected at a shop. A seller who refuses is giving you information too. Plan for the car to be with us for a few hours, and call ahead so we can fit it in when the board allows. We are open Monday to Friday 8 AM to 5 PM and Saturday 8 AM to 2 PM, at Foothill Blvd and Central Ave, one block east of In-N-Out Burger. If the seller is bringing the car, send them the address and our number, [(909) 608-7699](tel:+19096087699), so they can call if they are running late. Before the visit, run the VIN through the [NHTSA recall lookup](https://www.nhtsa.gov/recalls) so open recalls are on your list. Bring any service records the seller has. The price of the inspection is on the written estimate before we start, and AAA members get 10% off parts and labor, up to $75, with the card at time of service. For other checks you can order on a car you already own, see our full list of [diagnostics and inspections](https://route66autorepairshop.com/diagnostics-and-inspections). ## Frequently asked questions ### Do you offer a cheaper, shorter pre-purchase inspection? No. The Deluxe PPI is the only inspection we offer for a car you are thinking of buying. Every part of it, from the checklist to the buy-or-walk letter, is there because leaving it out would leave you guessing. ### Can a pre-purchase inspection tell me the car will not break down? No inspection can promise that. It shows the condition of the car on the day it was checked and flags the risks it can see. It cannot see inside sealed components or predict a part that fails later. ### What if the seller will not allow a road test? We complete everything else and the letter states that the road test was not done. Without it, shifting, braking and noise under load stay unknown, so the recommendation reflects that gap. ### Why is a second sign-off part of the inspection? A second person reviewing the photos, scan and checklist catches things the first person missed and questions findings that seem off. It also makes sure no box was left empty before the letter goes out. ### Does the scan show if codes were recently cleared? It often does. Readiness monitors that have not completed are a common sign that the battery was disconnected or codes were cleared recently. The report flags that so you can ask the seller why. ### Can I use the report to negotiate the price? Yes. The photos and the written findings give you something concrete to show the seller. You can use the buy-with-conditions items to ask for repairs or a lower price before they sign. --- Call (909) 608-7699 or visit https://route66autorepairshop.com/contact for a written estimate.