Mercedes EQS Reliability: Long-Term Infotainment Assessment

The Mercedes EQS has been on sale since 2021, and enough examples have now accumulated serious mileage for patterns to emerge. The question every luxury EV buyer is asking in 2026 is simple: does the flagship electric sedan hold up, or does its tech-heavy interior become a liability?

We’ve combed through owner forums, service bulletins, and independent surveys to separate genuine concerns from anecdotal noise. The EQS represents Mercedes-Benz’s most ambitious bet on software-defined vehicles.

Its MBUX Hyperscreen spans the entire dashboard, and that complexity cuts both ways — it delivers stunning visuals but also introduces failure modes traditional Mercedes sedans never faced.

How Has the Mercedes EQS Held Up on Reliability?

The short answer: drivetrain reliability is excellent, but electronic gremlins remain the EQS’s Achilles’ heel. Independent surveys and owner forums consistently rate the electric motor and battery systems as highly dependable, with few reported failures over 50,000-plus mile intervals. The 108 kWh battery pack has shown minimal degradation in real-world usage, typically retaining over 90 percent capacity after three years.

However, the same cannot be said for ancillary systems. Owners have reported issues with the air suspension compressor, door handles that intermittently fail to present, and sensor calibration problems affecting driver assistance features. Mercedes has addressed many of these through over-the-air updates, but some require physical service visits. The EQS’s complexity means repair costs are substantial when things do fail. A single Hyperscreen replacement reportedly costs thousands of dollars, making extended warranties a serious consideration for prospective buyers.

Is the MBUX Hyperscreen Infotainment System ageing well?

The MBUX Hyperscreen remains visually stunning in 2026, but its functionality has become a double-edged sword for long-term owners. The 56-inch curved display unit is genuinely impressive, yet its reliance on touch controls for virtually every function creates frustration when the system lags or glitches.

Software updates have improved responsiveness considerably since launch. Early complaints about slow boot times and occasional freezes have largely been resolved through OTA patches. That said, owners report the system still struggles with prolonged use, particularly during extreme temperatures when the screen’s cooling fan becomes audible. The bigger concern is long-term support. Mercedes has committed to updates for existing EQS models, but the rapid evolution of its MB.OS platform means older hardware may not receive all future features. This is a legitimate consideration for buyers planning to keep their EQS beyond five years.

What Are the Most Common EQS Problems Reported by Owners?

Owner forums and consumer complaint databases reveal a consistent pattern of issues. The most frequently cited problems involve the 12-volt auxiliary battery, which can drain unexpectedly and leave the car unable to start. This mirrors issues seen in other EVs, but the EQS’s extensive standby electronics make it particularly susceptible. Other common complaints include:

• Creaking noises from the panoramic glass roof during temperature changes
• Intermittent failures of the rear-axle steering system, requiring recalibration
• Charging port flap malfunctions that prevent proper sealing
• Software glitches affecting the ambient lighting and seat massage functions

None of these are catastrophic, but they accumulate. The EQS’s build quality is generally excellent, with solid panel gaps and premium materials, yet the sheer number of electronic systems creates more potential failure points than any previous Mercedes flagship.

How Does EQS Reliability Compare to Other Luxury EVs?

The EQS occupies a middle ground in the luxury EV reliability hierarchy. Tesla’s Model S has a longer track record but suffers from similar electronic gremlins, while the Porsche Taycan has proven more mechanically robust despite higher service costs.

The Lucid Air, the EQS’s closest rival, has shown comparable software issues but fewer suspension problems. What distinguishes the EQS is the breadth of its feature set. No competitor offers the same level of interior technology, and that ambition carries inherent risk.

Should You Buy a Used Mercedes EQS in 2026?

For buyers considering a used EQS, the value proposition is compelling but requires due diligence. Depreciation has been steep — often cited as exceeding 50 per cent over three years — making the EQS an attractive premium EV purchase for those willing to accept the risks. A well-maintained example with service history is essential.

Key checks before purchase include verifying the 12-volt battery’s condition, confirming all software updates are current, and testing every electronic feature during the test drive. Extended warranty coverage is strongly recommended, as out-of-pocket repairs can be substantial. The EQS remains a remarkable vehicle that delivers effortless performance and unmatched luxury. Its long-term reliability story is still being written, but current evidence suggests the drivetrain will outlast the electronics. For the right buyer, that trade-off may be entirely acceptable. More on Tata Nexon as the story develops.

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FAQs

How long do Mercedes EQS batteries typically last?

The 108 kWh battery pack is designed to retain over 90 percent capacity after several years of use, with most owners reporting minimal degradation even beyond 50,000 miles.

Are Mercedes EQS repairs expensive?

Yes, repairs can be costly, particularly for the Hyperscreen display and air suspension components. Extended warranty coverage is strongly recommended for long-term ownership.

Has Mercedes fixed the early EQS software issues?

Most early glitches have been addressed through over-the-air updates, though some owners still report occasional system lag and intermittent electronic faults.

Is the EQS more reliable than the Tesla Model S?

Both vehicles experience similar electronic issues, but the EQS benefits from a more established Mercedes dealership network and arguably better drivetrain durability.

What should I check before buying a used EQS?

Verify the 12-volt battery condition, confirm all software updates are installed, test every electronic feature, and review the complete service history.