It depends on the car, but the inspection usually covers mechanical condition, diagnostics, paint and body, wear patterns, and whether the seller story matches what the car is showing.
That can include ECU scans, over-rev review where it applies, paint meter readings, evidence of prior repairs, cold-start behavior, and the model-specific problem areas that actually matter for that chassis.
You come away with a clear read on what is normal, what is expensive, and what should change your decision.