Pre-purchase inspection checklist

2015 Mercedes-benz S-Class S550

VIN WDDUG8CB7FA171605

Inspect these first — most-reported on this model

Seat Belts (8 owner reports)Check that every belt latches, retracts and locks under a sharp tug, and that none are frayed.
Structure (6 owner reports)Inspect for rust, fresh undercoating, mismatched paint, uneven panel gaps and any sign of prior collision or frame repair.
Electrical System (6 owner reports)Test every electrical feature: windows, locks, infotainment, charging and all lights. Watch for flickering, dead accessories or warning lights.
Wheels (5 owner reports)Inspect wheels for bends, cracks and curb rash, and feel for vibration at highway speed.
Air Bags (5 owner reports)Confirm the airbag light turns on then off at startup — if it stays lit there's a fault (costly, and a safety risk). Check for signs of prior deployment.
Steering (4 owner reports)Steering should be tight and centered — no play, clunks or wandering. Test at low and highway speed; listen for power-steering whine.

Paperwork & identity

VIN on the dash, driver door jamb and title all match exactly.
Seller's name matches the title and photo ID.
Service and repair records available and consistent with the mileage.
No lien still listed on the title (ask for a lien release if there was one).

Engine & drivetrain

Cold-start the engine — listen for knocks, ticking or rattles.
No blue (oil) or white (coolant) smoke from the exhaust.
Fluids clean and at level — oil, coolant, brake and transmission.
No oil, coolant or transmission leaks under the car after it idles.
All dashboard warning lights clear a few seconds after startup.

Body, tyres & underside

Panel gaps even; paint colour and texture match across panels (repaint = past damage).
No fresh undercoating hiding rust or recent weld repairs.
Tyres worn evenly and matched; check the date codes and the spare.
No rust on the frame, floor pans, suspension mounts or brake lines.

Test drive

Shifts smoothly through every gear — no slipping, shudder or clunk.
Brakes straight and quiet — no pulling, grinding or pulsing.
Steering tracks straight; no vibration at highway speed.
Air-con, heater, lights, wipers, windows and infotainment all work.

Before you pay

Independent pre-purchase inspection by a trusted mechanic.
Open safety recalls confirmed fixed (a franchised dealer repairs them at no charge).
Agreed price reflects anything the inspection turned up.

Notes

Vehicle data only — no owner information. This checklist is informational and based on NHTSA complaint patterns for the 2015 Mercedes-benz S-Class; it is not a substitute for a professional inspection or a guarantee of condition. Full history report at https://carlogs.xyz/WDDUG8CB7FA171605/2015/mercedes-benz/s-class/nv/usa.