What Actually Happens During a Vehicle Inspection

People ask me what I'm doing out there for an hour and a half. Fair question.

I show up to wherever the car is. Seller's driveway, a dealer lot, some parking lot in Aurora. I get the keys and I start outside.

Outside the car

Panel gaps first. I'm running my fingers along where body panels meet before I even open a door. Uneven gaps between the fender and the door, or between the hood and the bumper. That's usually collision repair. Could be minor, could be major. But it's always worth knowing.

Then the paint thickness meter comes out. I go over every panel. Factory paint reads consistent across the car. A repainted quarter panel will read two or three times higher than the door next to it. I had one where the entire passenger side read 16-20 mils and the driver side was stock at 5. Whole side of the car had been redone. Seller said he didn't know about any accidents. Maybe. Maybe not. But the meter doesn't have opinions, it just reads numbers.

Windshield cracks are usually just a negotiating point. Windshield cracks where the seal is also pulling away from the frame. That's water getting in, and that's a different problem.

Inside

I'm not here to tell you the seats are scuffed. I'm reading what the interior says about how the car lived. A driver's bolster that's worn smooth on a car with 35,000 miles on it? Somebody was in and out of that car a lot more than 35,000 miles worth. Could be a delivery driver, could be rolled back, could be nothing. But I note it.

Smell matters more than people realize. Smoke is obvious. Mold less so. And that aggressive chemical clean smell where someone clearly detailed the interior right before the showing. I pay attention to what they might have been covering.

I test every switch, every button. Windows, locks, mirrors, climate. Heated seats if it has them. The instrument cluster gets checked at startup. Every warning light should come on briefly and then go off. No check engine light during that startup sequence? Somebody may have pulled the bulb.

Under the hood

I pop the oil filler cap and look at the underside. If there's tan, caramel colored residue built up on it, that's coolant mixing with oil. Head gasket. Five second check that can save you $2,000.

Transmission fluid gets checked. It should be pinkish red, not brown, and shouldn't smell burnt. Coolant should be clean, not milky. I go through brake fluid, power steering, belts, hoses. I test the battery and charging system. Engine mounts are one people don't think about, but a worn mount causes vibration that gets blamed on a dozen other things.

Leaks get traced. A valve cover gasket seeping a little oil on a high mileage engine is maintenance. An active drip from the rear main seal is a much bigger conversation.

The scanner

I connect my diagnostic scanner and pull everything the car's computer knows. Active codes. Pending codes, the ones where the system flagged something but hasn't turned the check engine light on yet. Freeze frame data that shows what conditions were present when a code triggered.

Readiness monitors are the one most people haven't heard of. When someone clears codes before a showing, the monitors reset. They need drive cycles to complete again. If I see a bunch of incomplete monitors on a car that's supposedly been driven normally, someone cleared codes recently. That's not a guess. The data is right there.

On EVs and hybrids I bring the Autel Ultra EV. Standard OBD scanners can't read battery State of Health or individual cell voltages. This one can. It's a $5,000 scanner and it earns its keep on every EV inspection.

Underneath

I get under the car. This is where Colorado shows up. Mag chloride from winter road treatment eats at metal over time. Surface rust on a frame rail is normal for a car that's been here a few winters. Pitting at a subframe mounting point is a different situation.

I check the suspension: control arm bushings, ball joints, tie rods, CV boots. Brake pad thickness gets measured, rotors get inspected. Exhaust. On higher mileage cars I'm looking harder at everything that takes load because that's where deferred maintenance shows up first.

Road test

Short version: I drive it and I listen. Longer version: I'm checking how the transmission shifts under load, whether it hunts between gears, whether the brakes pull. Steering feel at speed. Suspension behavior over rough pavement. There's plenty of rough pavement around Denver to test on. Any noise that shouldn't be there, I'm trying to isolate where it's coming from.

A car can feel fine at 25 mph in a parking lot and reveal a lot at 55 on a surface street.

After

Everything goes into a report with photos organized by system. I flag things in three buckets: safety issues, maintenance that's needed, and stuff to keep an eye on. You get the report within 24 hours.

With the Complete inspection and above, I schedule a call and walk through everything. That call matters. A report can say "inner tie rod has play" and unless you know what that means and what it costs, it's just words. On the call I can tell you whether that's a $200 fix or a reason to walk away. Different cars, different contexts, different answers.