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Ford Mustang Mach-E vs Mercedes EQA / EQB: which engine is more reliable?

According to our risk index, the Ford Mustang Mach-E carries less risk than the Mercedes EQA / EQB: 32/100 versus 36/100 (both moderate risk). The Ford Mustang Mach-E has 1 documented serious fault, the main one being «High-voltage battery contactors overheating: loss of power»; the Mercedes EQA / EQB has 2 documented serious faults, the main one being «Internal short circuit in the high-voltage battery: fire risk, software update and battery replacement».

Risk index

Ford Mustang Mach-E

32

Moderate risk · 1 serious fault

Lower risk

Risk index

Mercedes EQA / EQB

36

Moderate risk · 2 serious faults

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

15 sourcesHow we work

Is the Ford Mustang Mach-E reliable?

The Mach-E's electrical system has one documented weak point in Europe: the high-voltage battery contactors, which overheat and can cause a loss of power. Ford first fixed it with software (2022) and then by replacing the battery junction box (2023). No motor or battery faults have been published in Europe beyond that.[1][2][3]

See the of the Ford Mustang Mach-E fault

Is the Mercedes EQA / EQB reliable?

The only well-documented faults in the EQA and EQB electric drivetrain are the battery recalls for fire risk (2025 and 2026, the latter with battery replacement) and a 2024 pyrofuse check. No recurring faults have been published.[4][5][6][7]

See the 2 of the Mercedes EQA / EQB faults

Side-by-side comparison

Comparison of Ford Mustang Mach-E and Mercedes EQA / EQB
Ford Mustang Mach-EMercedes EQA / EQB
Technical data
TypeEngineEngine
FuelElectricalElectrical
Displacement——
Timing——
Power268–487 hp190–292 hp
Productionsince 2021[8][9][10]since 2021[11]
Reliability
Risk index (what is it?)32Moderate risk36Moderate risk
Documented faults12
Of high or critical severity12
Worst severityHigh severityCritical severity
Main faults
  1. High severity: High-voltage battery contactors overheating: loss of power
  1. Critical severity: Internal short circuit in the high-voltage battery: fire risk, software update and battery replacement
  2. Critical severity: Displaced pyrofuse housing: possible pyrotechnic fuse failure and loss of power
Most expensive documented repairNo reliable dataNo reliable data
Which versions to buy
BuyRecommended versionsNoneNone
With cautionVersions to be cautious about
  • Standard Range, 75.7 kWh battery, 269-329 hp (2021-2025)[1][2]
  • Extended Range, 98.8 kWh battery, 276-375 hp (2021-present)[12][13]
  • GT, 98.8 kWh battery, 487 hp (2021-present)[12][14]
  • EQA 250, 300 4MATIC and 350 4MATIC, 69.7 kWh (2021-present)[4][5][6]
  • EQA 250+, 73.9 kWh, 190 hp (2022-present)[6][15]
AvoidVersions to avoidNoneNone

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

Ford Mustang Mach-E

Mercedes EQA / EQB

Other comparisons

With the Ford Mustang Mach-E

With the Mercedes EQA / EQB

Compare other engines

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Sources

Every fact on this page links to its source. If you find an error, let us know.

  1. Rückruf Ford Mustang Mach-E: Hochvolt-Batterieauto motor und sport · Motoring press · consulted 30 October 2026 · in German
  2. Ford Mustang Mach-E: battery switch overheats after recall (KBA 013267)car-recalls.eu · Other source · published 19 December 2023 · consulted 30 October 2026
  3. Fiabilité Ford Mustang Mach-E: pannes et avisfiches-auto.fr · Motoring press · consulted 30 October 2026 · in French
  4. Recall: Mercedes-Benz EQA (2021 - 2024) EV/Hybrid, fire (2025)car-recalls.eu · Other source · published 5 April 2025 · consulted 30 October 2026
  5. Recall: Mercedes-Benz EQA (2021 - 2024) EV/Hybrid, fire (2026)car-recalls.eu · Other source · published 8 March 2026 · consulted 30 October 2026
  6. Segunda llamada a revisión de los Mercedes EQA y EQB por riesgo de incendio. Toca cambiar la bateríaAutofácil · Motoring press · published 15 April 2026 · consulted 30 October 2026 · in Spanish
  7. Recall: Mercedes-Benz EQA (2024) electronic, injury (pirofusible)car-recalls.eu · Other source · published 25 October 2024 · consulted 30 October 2026
  8. Ford Mustang Mach-E 1. Generation: ModellvariantenADAC Autokatalog · Technical documentation · consulted 30 October 2026 · in German
  9. Ford Mustang Mach-E reviewDrive (antes Honest John) · Motoring press · consulted 30 October 2026
  10. Ford Mustang Mach-EWikipedia (inglés) · Other source · consulted 30 October 2026
  11. Mercedes-Benz EQAWikipedia · Other source · consulted 30 October 2026
  12. Ford Mustang Mach-E: Probleme mit dem HochvoltschützÖAMTC · Consumer association · published 28 December 2023 · consulted 30 October 2026 · in German
  13. Ford Mustang Mach-E: Rückruf wegen Leistungsverlustfuturezone.at · General press · published 20 October 2023 · consulted 30 October 2026 · in German
  14. Ford Mustang Mach-E: Rückruf wegen überhitzender Hochvoltbatterieecomento.de · Motoring press · published 24 June 2022 · consulted 30 October 2026 · in German
  15. Es probable que Mercedes sustituya las baterías de los modelos EQA y EQB en Alemaniaelectrive · Motoring press · published 17 February 2026 · consulted 30 October 2026 · in Spanish