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ProblemsByVin Checklist / 2015-MERCEDES-BENZ-S-CLASS

Pre-purchase · Buyer's checklist

2015 Mercedes-Benz S-Class inspection checklist

The 2015 Mercedes-Benz S-Class has 51 owner complaints with NHTSA across 6 component categories. Use this checklist before you put money down — every item below is grounded in the actual failure pattern on this vehicle, not generic advice.

1 Inspect the seatbelts

What to look for: Anything that looks, sounds, or smells different from peer vehicles of the same year and trim. (6 owner complaints on this vehicle · typical repair $500 )

Walk around and note any visible damage, wear, or aftermarket modifications
Open the hood and look for fresh fluid leaks, loose connectors, or recent part swaps
Sit in every seat and operate every control to confirm function

See full seatbelts report for this vehicle →

2 Inspect the body

What to look for: Paint mismatch between panels (prior accident), rust on rocker panels and wheel wells, door alignment gaps that don't match side-to-side, weatherstrip wear. (5 owner complaints on this vehicle · typical repair $1,500 )

Panel gaps — should be even and consistent; tight on one side means body work
Trunk and hood weatherstrips for cracks
Inside the trunk, under the spare — water staining means a leak
Door hinge bolts for paint dust (telltale of door replacement)
VIN plate on the dash matches the VIN sticker on the door jamb

See full body report for this vehicle →

3 Inspect the wheels

What to look for: Anything that looks, sounds, or smells different from peer vehicles of the same year and trim. (5 owner complaints on this vehicle · typical repair $400 )

Walk around and note any visible damage, wear, or aftermarket modifications
Open the hood and look for fresh fluid leaks, loose connectors, or recent part swaps
Sit in every seat and operate every control to confirm function

See full wheels report for this vehicle →

4 Inspect the airbags

What to look for: Anything that looks, sounds, or smells different from peer vehicles of the same year and trim. (4 owner complaints on this vehicle · typical repair $1,100 )

Walk around and note any visible damage, wear, or aftermarket modifications
Open the hood and look for fresh fluid leaks, loose connectors, or recent part swaps
Sit in every seat and operate every control to confirm function

See full airbags report for this vehicle →

5 Inspect the electrical

What to look for: Dim or flickering dash lights at idle, slow window operation, intermittent infotainment glitches, parasitic battery drain (dead battery after a few days parked). (4 owner complaints on this vehicle · typical repair $850 )

Battery age sticker — most batteries last 3–5 years
Alternator output at idle (13.8–14.5V is healthy)
All exterior lights: headlights both beams, taillights, brake lights, reverse, blinkers
Every interior switch: power windows, locks, mirrors, sunroof, seats
Infotainment cold-start time and touchscreen responsiveness

On the test drive: Cycle through every electronic accessory during the drive — heated seats, defrosters, climate fan on max, cruise control. Glitches show up under load.

See full electrical report for this vehicle →

6 Inspect the steering

What to look for: Wandering on the highway, clunks when turning, slop in the wheel before the tires respond, power steering whine. (4 owner complaints on this vehicle · typical repair $700 )

Tire wear pattern — uneven wear across the tread means alignment or worn suspension
Power steering fluid level (where applicable — most newer vehicles are electric)
Tie rod boots and ball joint boots for tears
Steering wheel free play — should be less than 1 inch at the rim

On the test drive: On a smooth highway, take hands off briefly (when safe) — vehicle should track straight. Pulling left or right means alignment or worn front-end parts.

See full steering report for this vehicle →

7 Paperwork — before you sign

The seller's transparency on these tells you what kind of seller you're dealing with.

Title in seller's name (not "open title" or "signed by previous owner")
Service records — at least the last 24 months
VIN on the dash matches the door jamb sticker and the title
Run a paid vehicle history report (Carfax or AutoCheck) — accident, salvage, odometer rollback
Confirm any open recalls have been completed (NHTSA VIN lookup)
If financing, get the rate in writing before you set foot on the lot

Inspection items derived from 51 owner complaints and 0 active recall campaigns filed with NHTSA on the 2015 Mercedes-Benz S-Class. Category-specific guidance is written by ProblemsByVin contributors with ASE-certified mechanic review. This checklist is meant to surface known patterns — it doesn't replace a paid pre-purchase inspection by a qualified shop, which we recommend for any used vehicle priced over a few thousand dollars.