MG eléctrico (MG4, ZS EV, Marvel R) engine: faults and reliability

• MG4 Standard Range 51 kWh LFP, 170 hp (2022-present)

  since 2022 · 170 hp

  With caution

  What Car? places the MG4 among the less reliable electric cars in its UK survey, mainly for minor electrical faults; for the 51 kWh version no specific battery or motor faults are documented.^[2]

• MG4 Long Range 64 kWh, 204 hp (2022-present)

  since 2022 · 204 hp

  With caution

  It is the version with the most testimonies: fiches-auto records 47 reviews of the 204 hp one, with charger and battery faults among those cited; test AC and DC charging before buying.^[1]

• MG4 Extended Range 77 kWh, 245 hp (2023-present)

  since 2023 · 245 hp

  With caution

  We have not seen testimonies specific to this version in open sources; the general MG4 data applies: verify charging and campaigns.^[1][2]

• MG4 XPower 64 kWh, 435 hp (2023-present)

  since 2023 · 435 hp

  With caution

  A German owner describes repeated faults in the car's control system with loss of charge on an XPower; it is an isolated case, but it shows that workshop history should be demanded.^[8]

• ZS EV 44.5 kWh, 143 hp (2019-2021)

  2019–2021 · 143 hp

  With caution

  A documented case on a British forum of traction battery failure on a 2019 ZS EV with low mileage; it is a single testimony, but it advises asking for a battery condition report.^[9]

• ZS EV Standard Range 51 kWh LFP, 150 hp (2022-2024)

  2022–2024 · 150 hp

  With caution

  Almost no published testimonies for this version (the fiches-auto listing records no reviews); charging is verified as for the rest.^[10]

• ZS EV Long Range 72.6 kWh, 177 hp (2021-2024)

  2021–2024 · 177 hp

  Buy

  No battery or motor faults documented in open sources for this version; fiches-auto mentions only one on-board charger fault among ZS EVs in general.^[10]

• Marvel R Comfort/Luxury 70 kWh, 180 hp (2021-2024)

  2021–2024 · 180 hp

  With caution

  Fiches-auto records on-board AC charger faults on the Marvel R; it is a minority model with little data.^[3]

• Marvel R Performance 70 kWh, 288 hp (2021-2024)

  2021–2024 · 288 hp

  With caution

  Of the 12 fiches-auto reviews for this version, 2 mention the charger and none a motor fault; small sample.^[3]

Buy: No known serious faults, or they have already been corrected, in this version. With caution: Worth buying if something specific is verified: history, a replaced part or a completed campaign. Avoid: High risk of a serious fault that is hard to check for or prevent.

1. 1Medium severityFrequency: OccasionalChargingCharging faults: on-board charger and interrupted chargingOn the MG4, ZS EV and Marvel R there are owners who see AC charging rejected or interrupted; fiches-auto attributes it to the on-board charger or its software. It is an occasional issue, not a systemic one.
2. 2High severityFrequency: RarePower electronicsHigh-voltage system fault warning and loss of propulsionIsolated cases have been documented of MG4 and ZS EV cars going into limp mode or losing propulsion with high-voltage system warnings. They are scattered testimonies, with no official diagnosis or campaign.

Severity colours: low, medium, high, critical. How we rate them

Manufacturer

SAIC Motor (MG Motor)

Family

MSP / ZS EV / Marvel R

Type

Electrical

Engine

Síncrono de imanes permanentes con reductor de una relación; tracción trasera en el MG4 y el Marvel R base, delantera en el ZS EV y total en el MG4 XPower y el Marvel R Performance

Battery

44.5–77 kWh

Power

143–435 hp

Peak torque

665 Nm

Production

since 2019

Makes

MG

Technical data^[4][5][6][7]

1. 2019–2021

   ZS EV 44.5 kWh, 143 hp (2019-2021)

   First electric version of the ZS, with a 44.5 kWh NMC battery and a 105 kW (143 hp) front motor and 350 N·m.^[5]

2. 2021–2024

   ZS EV Long Range 72.6 kWh, 177 hp (2021-2024)

   72.6 kWh NMC battery and 130 kW (177 hp) motor since the late 2021 facelift.^[5]

3. 2021–2024

   Marvel R Comfort/Luxury 70 kWh, 180 hp (2021-2024)

   Two electric motors on the rear axle (132 kW in total, 410 N·m) and a 70 kWh battery.^[7]

4. 2021–2024

   Marvel R Performance 70 kWh, 288 hp (2021-2024)

   Adds a front motor for all-wheel drive: 212 kW (288 hp) and 665 N·m with the same 70 kWh battery.^[7]

5. since 2022

   MG4 Standard Range 51 kWh LFP, 170 hp (2022-present)

   CATL LFP battery of 51 kWh (50.8 kWh usable) and a 125 kW permanent-magnet synchronous motor on the rear axle, with 250 N·m and fast charging of up to 88 kW.^[4][12]

6. since 2022

   MG4 Long Range 64 kWh, 204 hp (2022-present)

   CATL NMC battery of 64 kWh gross (59.5 kWh net) and 150 kW (204 hp) rear motor with 250 N·m; fast charging of up to 140 kW and a battery warranty of 7 years or 150,000 km with 70% state of health.^[4][6]

7. 2022–2024

   ZS EV Standard Range 51 kWh LFP, 150 hp (2022-2024)

   After the 2021 facelift a 51.1 kWh LFP battery was added, with a 110 kW (150 hp) motor.^[5]

8. since 2023

   MG4 Extended Range 77 kWh, 245 hp (2023-present)

   77 kWh NMC battery (74.4 kWh usable) and 180 kW (245 hp) rear motor with 350 N·m, available in Europe from August 2023.^[4]

9. since 2023

   MG4 XPower 64 kWh, 435 hp (2023-present)

   All-wheel-drive version with two motors (150 kW front and 170 kW rear, 600 N·m in total) and the 64 kWh battery.^[4]