Ford Mustang Mach-E vs MG eléctrico (MG4, ZS EV, Marvel R): which engine is more reliable?

According to our risk index, the MG eléctrico (MG4, ZS EV, Marvel R) carries less risk than the Ford Mustang Mach-E: 20/100 (low risk) versus 32/100 (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 MG eléctrico (MG4, ZS EV, Marvel R) has 1 documented serious fault, the main one being «High-voltage system fault warning and loss of propulsion».

Risk index

Ford Mustang Mach-E

Moderate risk · 1 serious fault

Risk index

MG eléctrico (MG4, ZS EV, Marvel R)

Low risk · 1 serious fault

Lower risk

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

Reviewed on 30 October 202619 sources How 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 MG eléctrico (MG4, ZS EV, Marvel R) reliable?

MG electric cars have few documented battery or motor faults; the most cited is AC charging, which is sometimes rejected or interrupted. What Car? places the MG4 in the lower part of its survey, mainly for minor electronics.^[4][5][6]

See the 2 of the MG eléctrico (MG4, ZS EV, Marvel R) faults

Side-by-side comparison

Comparison of Ford Mustang Mach-E and MG eléctrico (MG4, ZS EV, Marvel R)
Item	Ford Mustang Mach-E	MG eléctrico (MG4, ZS EV, Marvel R)
Technical data
Type	Engine	Engine
Fuel	Electrical	Electrical
Displacement	—	—
Timing	—	—
Power	268–487 hp	143–435 hp
Production	since 2021^[7][8][9]	since 2019^{[10][11][12][13]}
Reliability
Risk index (what is it?)	32Moderate risk	20Low risk
Documented faults	1	2
Of high or critical severity	1	1
Worst severity	High severity	High severity
Main faults	High severity: High-voltage battery contactors overheating: loss of power	Medium severity: Charging faults: on-board charger and interrupted charging High severity: High-voltage system fault warning and loss of propulsion
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	None	ZS EV Long Range 72.6 kWh, 177 hp (2021-2024)^[14]
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)^[15][16] GT, 98.8 kWh battery, 487 hp (2021-present)^[15][17]	MG4 Standard Range 51 kWh LFP, 170 hp (2022-present)^[5] MG4 Long Range 64 kWh, 204 hp (2022-present)^[4] MG4 Extended Range 77 kWh, 245 hp (2023-present)^[4][5] MG4 XPower 64 kWh, 435 hp (2023-present)^[18] ZS EV 44.5 kWh, 143 hp (2019-2021)^[19] ZS EV Standard Range 51 kWh LFP, 150 hp (2022-2024)^[14] Marvel R Comfort/Luxury 70 kWh, 180 hp (2021-2024)^[6] Marvel R Performance 70 kWh, 288 hp (2021-2024)^[6]
AvoidVersions to avoid	None	None

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

Ford Mustang Mach-E

MG eléctrico (MG4, ZS EV, Marvel R)

Other comparisons

With the Ford Mustang Mach-E

With the MG eléctrico (MG4, ZS EV, Marvel R)

Compare other engines

First engine

Second engine

That is the comparison you are viewing: change one of the two engines.

Sources

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

Rückruf Ford Mustang Mach-E: Hochvolt-Batterieauto motor und sport · Motoring press · consulted 30 October 2026 · in German
Ford Mustang Mach-E: battery switch overheats after recall (KBA 013267)car-recalls.eu · Other source · published 19 December 2023 · consulted 30 October 2026
Fiabilité Ford Mustang Mach-E: pannes et avisfiches-auto.fr · Motoring press · consulted 30 October 2026 · in French
Fiabilité Mg MG4 (2023): toutes les pannes connuesFiches-auto.fr · Reliability study · consulted 30 October 2026 · in French
Used MG4 2022-present reliabilityWhat Car? · Reliability study · consulted 30 October 2026
Fiabilité Mg Marvel R (2021): toutes les pannes connuesFiches-auto.fr · Reliability study · consulted 30 October 2026 · in French
Ford Mustang Mach-E 1. Generation: ModellvariantenADAC Autokatalog · Technical documentation · consulted 30 October 2026 · in German
Ford Mustang Mach-E reviewDrive (antes Honest John) · Motoring press · consulted 30 October 2026
Ford Mustang Mach-EWikipedia (inglés) · Other source · consulted 30 October 2026
MG4 EVWikipedia · Other source · consulted 30 October 2026
MG ZS (crossover): sección MG EZS / ZS EVWikipedia · Other source · consulted 30 October 2026
Datos generales MG MG4 Electric Luxury (05/23 - 07/25)ADAC · Technical documentation · consulted 30 October 2026 · in German
MG Marvel R Electric: motores, equipamiento y preciosCarnovo · Technical documentation · published 21 July 2023 · consulted 30 October 2026 · in Spanish
Fiabilité Mg ZS: toutes les pannes connuesFiches-auto.fr · Reliability study · consulted 30 October 2026 · in French
Ford Mustang Mach-E: Probleme mit dem HochvoltschützÖAMTC · Consumer association · published 28 December 2023 · consulted 30 October 2026 · in German
Ford Mustang Mach-E: Rückruf wegen Leistungsverlustfuturezone.at · General press · published 20 October 2023 · consulted 30 October 2026 · in German
Ford Mustang Mach-E: Rückruf wegen überhitzender Hochvoltbatterieecomento.de · Motoring press · published 24 June 2022 · consulted 30 October 2026 · in German
Foro GoingElectric: MG4 XPower con fallo del sistema de control y sin cargaGoingElectric · Owners' forum · consulted 30 October 2026 · in German
Foro MGEVs: batería de tracción de un ZS EV de 2019 averiada con menos de 22.000 millasMGEVs.com · Owners' forum · published 26 August 2025 · consulted 30 October 2026