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Ford Mustang Mach-E vs Renault 5 E-Tech (AmpR Small): which engine is more reliable?

According to our risk index, the Ford Mustang Mach-E carries less risk than the Renault 5 E-Tech (AmpR Small): 32/100 versus 38/100 (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 Renault 5 E-Tech (AmpR Small) has 1 documented serious fault, the main one being «Anode delamination in 52 kWh battery cells (2026 campaign)».

Risk index

Ford Mustang Mach-E

32

Moderate risk · 1 serious fault

Lower risk

Risk index

Renault 5 E-Tech (AmpR Small)

38

Moderate risk · 1 serious fault

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

13 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 Renault 5 E-Tech (AmpR Small) reliable?

2024 drivetrain with little data: Fiches-auto.fr has only 11 owner reports, and the official issues are an inverter reprogramming (0EN5, around 15,700 cars from 2024) and a campaign over defective cells in the 52 kWh battery from December 2025 to January 2026. There is no longevity data.[4][5][6]

See the 3 of the Renault 5 E-Tech (AmpR Small) faults

Side-by-side comparison

Comparison of Ford Mustang Mach-E and Renault 5 E-Tech (AmpR Small)
Ford Mustang Mach-ERenault 5 E-Tech (AmpR Small)
Technical data
TypeEngineEngine
FuelElectricalElectrical
Displacement——
Timing——
Power268–487 hp95–150 hp
Productionsince 2021[7][8][9]since 2024[4][10]
Reliability
Risk index (what is it?)32Moderate risk38Moderate risk
Documented faults13
Of high or critical severity11
Worst severityHigh severityCritical severity
Main faults
  1. High severity: High-voltage battery contactors overheating: loss of power
  1. Critical severity: Anode delamination in 52 kWh battery cells (2026 campaign)
  2. Medium severity: Motor inverter: no-start fault and 0EN5 campaign reprogramming
  3. Medium severity: Rejections, errors and charging interruptions on the R5 E-Tech
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)[11][12]
  • GT, 98.8 kWh battery, 487 hp (2021-present)[11][13]
  • R5 E-Tech EV40 95 hp (70 kW, 40 kWh battery, 2024-present)[4][5]
  • R5 E-Tech EV40 120 hp (90 kW, 40 kWh battery, 2024-present)[4][5]
  • R5 E-Tech EV52 150 hp (110 kW, 52 kWh battery, 2024-present)[4][6]
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

Renault 5 E-Tech (AmpR Small)

Other comparisons

With the Ford Mustang Mach-E

With the Renault 5 E-Tech (AmpR Small)

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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. Fiabilité Renault R5 E-tech (2024) (11 témoignages)Fiches-auto.fr · Reliability study · consulted 30 October 2026 · in French
  5. Grosse alerte chez Renault : 16 000 véhicules rappelés en urgenceL'Automobiliste · General press · published 5 March 2025 · consulted 30 October 2026 · in French
  6. Rappel Renault 5 et R4 E-Tech : 19 véhicules concernés en France pour un risque de batterieMotorsActu · Motoring press · published 21 March 2026 · consulted 30 October 2026 · in French
  7. Ford Mustang Mach-E 1. Generation: ModellvariantenADAC Autokatalog · Technical documentation · consulted 30 October 2026 · in German
  8. Ford Mustang Mach-E reviewDrive (antes Honest John) · Motoring press · consulted 30 October 2026
  9. Ford Mustang Mach-EWikipedia (inglés) · Other source · consulted 30 October 2026
  10. Renault 5 E-TechWikipedia (en) · Other source · consulted 30 October 2026
  11. Ford Mustang Mach-E: Probleme mit dem HochvoltschützÖAMTC · Consumer association · published 28 December 2023 · consulted 30 October 2026 · in German
  12. Ford Mustang Mach-E: Rückruf wegen Leistungsverlustfuturezone.at · General press · published 20 October 2023 · consulted 30 October 2026 · in German
  13. Ford Mustang Mach-E: Rückruf wegen überhitzender Hochvoltbatterieecomento.de · Motoring press · published 24 June 2022 · consulted 30 October 2026 · in German