Mazda MX-30 e-Skyactiv 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 Mazda MX-30 e-Skyactiv: 20/100 (low risk) versus 29/100 (moderate risk). The Mazda MX-30 e-Skyactiv has 1 documented serious fault, the main one being «Motor Hill Assist and brake lights: software fault in the electric motor control»; 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

Mazda MX-30 e-Skyactiv

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 202618 sources How we work

Is the Mazda MX-30 e-Skyactiv reliable?

The MX-30 e-Skyactiv's electric powertrain has no faults of its own documented: the two European campaigns for the drivetrain (Motor Hill Assist on 2020 cars and the on-board charger on 2022–2023 cars) are corrected with software. We have found no battery degradation or motor faults in the sources consulted.^[1][2][3]

See the 2 of the Mazda MX-30 e-Skyactiv faults

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 Mazda MX-30 e-Skyactiv and MG eléctrico (MG4, ZS EV, Marvel R)
Item	Mazda MX-30 e-Skyactiv	MG eléctrico (MG4, ZS EV, Marvel R)
Technical data
Type	Engine	Engine
Fuel	Electrical	Electrical
Displacement	—	—
Timing	—	—
Power	145 hp	143–435 hp
Production	2020–2024^[7][8][9]	since 2019^{[10][11][12][13]}
Reliability
Risk index (what is it?)	29Moderate risk	20Low risk
Documented faults	2	2
Of high or critical severity	1	1
Worst severity	High severity	High severity
Main faults	High severity: Motor Hill Assist and brake lights: software fault in the electric motor control Medium severity: On-board charger (OBC) with faulty software: detects a cable that is not there and the car will not start	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	MX-30 e-Skyactiv EV 35.5 kWh, 145 hp (2020–2022)^[2][15] MX-30 e-Skyactiv EV 35.5 kWh, 145 hp, improved charging (2022–2024)^[1][16]	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)^[17] ZS EV 44.5 kWh, 143 hp (2019-2021)^[18] 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

Mazda MX-30 e-Skyactiv

Mazda MX-30

MG eléctrico (MG4, ZS EV, Marvel R)

Other comparisons

With the Mazda MX-30 e-Skyactiv

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

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Sources

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

Mazda MX-30: faulty charge controller software (KBA 012881)car-recalls.eu · Other source · published 18 July 2023 · consulted 30 October 2026
Mazda MX-30: brake lights and Motor Hill Assistcar-recalls.eu · Other source · published 18 February 2021 · consulted 30 October 2026
Mazda MX-30: problemas comunes y llamadas a revisióncar-recalls.eu · Other source · consulted 30 October 2026
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
Mazda MX-30Wikipedia (alemán) · Other source · consulted 30 October 2026 · in German
Mazda MX-30Wikipedia (francés) · Other source · consulted 30 October 2026 · in French
Mazda MX-30 DR: ModellvariantenADAC Autokatalog · Technical documentation · consulted 30 October 2026 · in German
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
Mazda MX-30 (2020): brake lights and Motor Hill Assist (alerta A12/00247/21)car-recalls.eu · Other source · published 26 February 2021 · consulted 30 October 2026
Mazda MX-30 (DR): starting problems, KBA recallcar-recalls.eu · Other source · published 26 June 2023 · consulted 30 October 2026
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