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What 29 owners told NHTSA about the 2018 Mercedes-benz S-class Phev

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (29)Crash / fire / injury (3)Engine (7)Brakes (5)Steering (5)Driver assistance (3)Fuel system (3)Suspension (3)Transmission & drivetrain (2)Airbags (1)Communication (1)Electrical system (1)

1 of 29 complaints match · Fuel system · crash/fire/injury only · clear filters

Feb 10, 2023SuspensionTransmission & drivetrainFuel systemCrashFire1 injury

Vehicle Check Engine Light turned on a Vehicle Lost power. Vehicle often hesitates upon acceleration. Convertible Top does not close as well intermittently.

NHTSA ODI 11506663

Working with the data? Download all 29 complaints as CSV · fetched from NHTSA July 21, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2018 Mercedes-benz S-class Phev verdict →