A Panamera 4S Executive and a long list of questions
The car was a 2018 Porsche Panamera 4S Executive, sitting at a dealership in Brea, CA. The buyer wasn't going to commit until someone independent had looked it over, and booked a Gold Inspection.
Their request was detailed. They wanted a diagnostic scan of the vehicle's modules, ideally with Porsche's PIWIS tool. They wanted the engine, the PDK transmission and the cooling system checked, along with a hunt for oil and coolant leaks. Suspension, steering, brakes and tires were on the list. So were the undercarriage, signs of past accidents or repainting, every electronic and interior feature, and a road test if the dealer would allow it.
There were limits. The dealership only permitted on-site inspections and had no vehicle lift. The inspector had to bring their own equipment and work within that setup.
A car like this carries a lot of hardware: all-wheel drive, a dual-clutch gearbox and a dense layer of electronics. Any one of them could be costly to get wrong. The buyer wanted to know what they were walking into before they signed anything.
What the Gold Inspection covered, and why it matters here
The Gold tier includes everything in Silver: body and paint condition with an eye for prior repair or respray; scratches, dents, cracks and rust; an underbody check for rust, frame damage or structural repair; tires, wheels and tread depth; glass; and evidence of accident or flood damage. It covers lights, A/C, gauges and other electrical items, the full interior, the motor and transmission, all driveline components including all-wheel-drive systems, and steering, suspension, brakes and exhaust.
Under the hood, the inspector does a visual check of the engine bay, fluid levels, oil leaks and missing parts, then runs an OBD-II scan for stored trouble codes. A road test evaluates the drivetrain when the car is street legal, insured and the weather is safe. The result is a photo-documented report with a go, caution or stop summary.
Gold adds three things. It adds paint-depth readings taken panel by panel, a full electronics and infotainment audit, and an extended road test with live OBD-II data capture. The first two matter on a luxury sedan. Paint-depth numbers can reveal refinished panels that look perfect to the eye, and a car with this many screens, cameras and driver aids has a lot of features to test.
One Gold item didn't happen. Live OBD-II data capture was not measured because of a venue rule, so the report has no live data log from the drive. The road test itself was completed and rated.
The good news, item by item
The exterior was rated excellent. Panel gaps were even and looked original. Glass and lights were all good, the wheels were in good shape, and tread depth was healthy at more than 6/32". The inspector found no rust on the body and no evidence of accident or flood damage.
Inside, the seats and upholstery were rated excellent. All the dash electronics worked, heat and A/C both worked, and every seat belt functioned. The cabin smelled clean, and interior wear was consistent with the car's mileage, which is one of the quieter checks on whether a car's story adds up.
Under the hood, the oil was clean and full and the coolant was full and clean. Belts and hoses were good, there were no visible leaks, and the engine started cold and idled smoothly. The buyer had specifically asked about oil and coolant leaks and the cooling system, so these lines answered their main mechanical worries.
Underneath, the frame was solid. The exhaust, suspension, CV boots, bushings, mounts and the all-wheel-drive driveline were all rated good, and the suspension was described as tight.
On the road, braking was smooth and straight, and the steering was centered and tight. The transmission shifted smoothly, which addressed the buyer's PDK question. The car was stable at highway speed, and there were no noises or vibrations. The OBD-II scan returned no stored codes.
Watch items worth knowing about
The report flagged no problems. Every rated item came back in the good column. A clean report still has fine print, and a careful buyer should read it.
Undercarriage corrosion was rated minimal rather than none. The rating was still good, and the frame was solid. It's worth looking at the photos so you know what's there now and can compare later.
The battery passed its load test but measured below its rating. More on that in the readings section. It isn't a problem today. It's something to keep in mind as the car ages.
Brake pads and tires are wear items. Both had plenty of life on this car, but neither lasts forever. Treat them as future budget items, not current concerns.
Two of the buyer's requests went partly unanswered. Live data capture didn't happen because of the venue rule. The report records an OBD-II scan with no stored codes, but it doesn't describe a Porsche PIWIS module-by-module scan. If that level of diagnostic depth matters to you, arrange it as a separate step.
What the instrumented readings say
Paint depth: Hood 110 µm, roof 115 µm, both front doors 120 µm, both rear quarters 122 µm, trunk 130 µm. What matters is consistency. A respray or heavy refinish usually shows up as one panel reading clearly thicker than its neighbors. Here the spread is narrow, left and right sides match exactly, and nothing stands out. That supports the inspector's finding of original panel gaps and no accident evidence.
Battery: Measured 950 CCA against a rated 1050 CCA, verdict Pass. Cold cranking amps measure how much starting power the battery can deliver. This one is about 100 CCA under its label and still within passing range. It's healthy now and worth retesting at future services.
Brakes: Front pads 8 mm, rear pads 10 mm, rotors good. Those are actual measurements of remaining pad material, not a visual guess. There's usable life at both ends, and the rotors didn't need attention.
Climate: A/C vent 50 °F, heater vent 130 °F. Both systems produced a clear temperature change at the vents, matching the finding that heat and A/C both work.
Electronics and infotainment audit: the touchscreen, backup camera, parking sensors, driver-assist features (blind-spot monitoring, lane assist and cruise) and power windows, locks and seats all passed. On a car this feature-heavy, that's a long list to clear.
How it shaped the decision
The report's guidance was Proceed, with no major issues. In plain English, the inspector called the car excellent cosmetically and mechanically, reported zero concerns, and said every function tested had passed.
For the buyer, that turned an unknown into a known. They went in worried about leaks, the PDK, the electronics and possible hidden bodywork. They came out with measurements and photos addressing each of those.
A clean report also changes the negotiation. There's little in the condition findings to argue price down on. What the report does give the buyer is documented proof of condition, a baseline for future maintenance, and a short list of items to recheck as the car ages.
If you're shopping for a similar car
Ask the seller about inspection access before you book. Find out whether the car can be inspected on site, whether there's a lift, and whether a road test is allowed. Dealer rules shaped what this inspection could capture.
Ask for paint-depth readings on any luxury car you're serious about. Compare panels against each other and left side against right. A panel that stands out deserves a closer look at the gaps and photos.
Read the measured numbers, not only the verdicts. A pass on a battery or brake check tells you it's fine today. The millimeters and CCA tell you how far it is from needing money.
Test every feature on a car with a long equipment list, including cameras, sensors, driver aids, seats and the infotainment screen. Each one is a potential repair you'd rather find before you buy.
If you want a manufacturer-level diagnostic scan, plan for it separately. A clean OBD-II scan is a strong signal, but it isn't the same thing.
Book your own inspection
This buyer went from a long list of worries to a clear Proceed, backed by photos and measurements. If you're weighing a used luxury sedan, or any used vehicle, you can book an independent pre-purchase inspection at VehicleInspectors.com and have an inspector in our network go to the car for you.