2020 Mercedes-Benz S-Class Common Problems & Defect Telemetry
Authoritative defect intelligence synthesized from 7 verified NHTSA owner complaints, 0 federal safety recalls, and interquartile failure mileage telemetry.
The 2020 Mercedes-Benz S-Class receives a 9.4/10 MazicBay Reliability Index based on 7 verified NHTSA federal complaints and 0 safety recalls. The primary reported failure mode is Electric Power Steering Assist & Suspension Noise Reports with a median failure point at 55,000 miles (IQR: 35,000 – 75,000 mi). Out-of-warranty repairs benchmark at $450 – $1,400 .
1.6 complaints / 10k sold
Verified US federal records
Crash, fire & stall audit
0 Active / Free Remedies
Top Reported Problem Clusters (5)
Electric Power Steering Assist & Suspension Noise Reports
- Sudden loss of electric power steering assist
- Steering wheel pull or highway wander
- Clunking / knocking noise over bumps
“Had windshield breakage and replacement on 14 December 2023. On 29 January 2024, had an apparent windshield strike (pinhead size) and windshield cracked from middle to top. Within 20 minutes crack had spread all across the top of windshield. While parked crack spread down and ...”
“AUTOMATIC DRIVE SHUTS OFF WHEN YOU BRAKE. HOWEVER, IN A ROLLING STOP AND BRAKE, IT DOES NOT RESTART IN CERTAIN SITUATIONS WHEN YOU ACCELERATE OUT OF THE STOP. IT IS INCONSISTENT, BUT SERVICE TEAM AT LOCAL DEALER HAVE RECREATED THE SITUATION. THE CAR IS DESIGNED TO AUTO RESTART...”
Engine Stalling, Oil Consumption & Cooling Defect Reports
- Engine sudden stall / hesitation while driving
- Abnormal oil burning / consumption
- Check Engine Light (MIL) flashing
- Engine overheating / coolant loss
“The contact owns a 2020 Mercedes-Benz S 560. The contact stated while driving 10 MPH, the check engine warning light illuminated. The vehicle was taken to the dealer, where the warning light was cleared; however, the failure recurred the following day. The vehicle was taken ba...”
Fuel Pump Pressure Loss & Fuel Delivery Defect Reports
- Sudden loss of propulsion power at highway speeds
- Extended engine cranking / failure to restart
- Fuel odor near fuel tank / engine bay
“The fuel pump My car stopped on the highway ... on ... with my children in the car with no warning at all. I was so lucky nobody hit us and it took 20 minutes of trying to start it to get off of the highway to a gas station where it cut off again The dealer said it is a known ...”
Electrical Parasitic Drain, Infotainment & Harness Reports
- Unexplained battery drain after sitting overnight
- Infotainment display / instrument cluster blackouts
- Accessory malfunction / alternator fault warnings
“The contact owns a 2020 Mercedes-Benz S 560. The contact stated while driving 10 MPH, the check engine warning light illuminated. The vehicle was taken to the dealer, where the warning light was cleared; however, the failure recurred the following day. The vehicle was taken ba...”
Service Brakes, ABS Actuator & Master Cylinder Reports
- Spongy or hard brake pedal travel
- ABS / Brake warning light illuminated
- Extended stopping distance / pedal vibration
“AUTOMATIC DRIVE SHUTS OFF WHEN YOU BRAKE. HOWEVER, IN A ROLLING STOP AND BRAKE, IT DOES NOT RESTART IN CERTAIN SITUATIONS WHEN YOU ACCELERATE OUT OF THE STOP. IT IS INCONSISTENT, BUT SERVICE TEAM AT LOCAL DEALER HAVE RECREATED THE SITUATION. THE CAR IS DESIGNED TO AUTO RESTART...”
Pre-Purchase Inspection Checklist for 2020 Mercedes-Benz S-Class
Before purchasing a used 2020 Mercedes-Benz S-Class, perform the following targeted inspections based on reported federal defect patterns:
Scan the OBD-II port under the dash for pending freeze-frame codes (e.g. P0300 misfires, P0087 fuel rail pressure, P0420 catalytic efficiency).
Test vehicle at low-speed stop-and-go and highway merges. Check for delayed reverse engagement or gear shift shudder between 2nd and 3rd gears.
Verify that all 0 NHTSA safety recall campaigns have been performed by an authorized dealership using the VIN.
Ensure the instrument cluster, center screen, and auxiliary charging ports operate with stable 12.0V–14.4V alternator voltage.
Defect & Reliability Q&A: 2020 Mercedes-Benz S-Class
Is the 2020 Mercedes-Benz S-Class a reliable used car?
The 2020 Mercedes-Benz S-Class earns a 9.4/10 MazicBay Reliability Index based on 7 federal owner reports. Vehicles maintained under factory service schedules exhibit strong longevity past 150,000 miles.
What is the most frequent defect reported on the 2020 Mercedes-Benz S-Class?
The leading complaint category is Electric Power Steering Assist & Suspension Noise Reports, with a median failure point around 55,000 miles (IQR: 35,000 – 75,000 mi).
Are there free recall repairs available for the 2020 Mercedes-Benz S-Class?
Yes, the NHTSA records 0 safety recall campaign(s) for this model year. All safety recalls are performed 100% free of charge by authorized franchise dealerships regardless of vehicle warranty status.