MG MG4 vs Renault Mégane E-Tech: which is more reliable?
According to the MotorFiable Score, the Renault Mégane E-Tech (7.7/10) has fewer serious documented faults than the MG MG4 (7.3/10), mainly because of the faults in the rest of the car (suspension, brakes, electronics…).
| Item | MG MG4 | Renault Mégane E-Tech |
|---|---|---|
| Segment | Compact | Compact |
| Years | 2022–today | 2022–today |
| MotorFiable Score | 7.3 out of 10 | 7.7 out of 10 |
| Engine score | 8.0/10 | 7.6/10 |
| Most recommended engine | MG eléctrico (MG4, ZS EV, Marvel R) · With caution | Renault-Nissan CMF-EV (Mégane E-Tech, Ariya) · With caution |
| Score for the rest of the car | 6.6/10 | 7.9/10 |
| Suspension | No documented faults | 9.6 out of 101 faultLow severity |
| Brakes | No documented faults | 8.6 out of 101 faultMedium severity |
| Electrical system | 9.3 out of 101 faultMedium severity | No documented faults |
| Electronics and infotainment | 7.5 out of 102 faultsHigh severity | 8.9 out of 101 faultLow severity |
| Climate control | 9.6 out of 101 faultLow severity | No documented faults |
| Bodywork and interior | 9.3 out of 101 faultLow severity | 9.3 out of 101 faultLow severity |
| Airbags and safety | 7.9 out of 101 faultHigh severity | No documented faults |
Scores out of 10: the higher, the fewer serious documented faults. How we calculate them
Main faults of the MG MG4
Outside the engine
- High severityFrequency: OccasionalAirbags and safetyOversensitive driver assistance (sudden braking, lane warning)In an Autopista test, the MG4's adaptive cruise control braked sharply several times for no real reason on detecting cars in adjacent lanes, and the lane keeping and drowsiness warning proved excessively sensitive; fiches-auto.fr records similar complaints from owners.
- High severityFrequency: OccasionalElectronics and infotainmentCentral locking and keyless entry that are unreliable (super-lock)In 2022 the British DVSA recorded a recall of 1,960 MG4s because the car could lock its doors when stopped, with them unable to be opened either from inside or outside; the fix is a software update. fiches-auto.fr adds reports of erratic openings.
- Medium severityFrequency: RareElectrical systemAbnormal 12 V battery drainSeveral owners describe the MG4's 12 V auxiliary battery draining abnormally while the car is parked, which can leave it unable to open the doors or start its on-board systems, according to a French compilation of testimonies.
In their engines
- Medium severityFrequency: OccasionalMG eléctrico (MG4, ZS EV, Marvel R)Charging 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.
- High severityFrequency: RareMG eléctrico (MG4, ZS EV, Marvel R)High-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.
Main faults of the Renault Mégane E-Tech
Outside the engine
- Medium severityFrequency: OccasionalBrakesParking lock (P position) may not engage: campaigns 0EWQ and 0EY9Two recalls issued in 2025 warned that the sensor on the Mégane E-Tech's parking brake actuator is misaligned, and the P-position lock may not engage properly when you select P, switch off the car, unfasten your seatbelt or open the door. The automatic parking brake still works.
- Low severityFrequency: CommonElectronics and infotainmentFreezing of the Mégane E-Tech's OpenR Link multimedia screenIt is the most cited fault on fiches-auto.fr: 29 of 86 testimonies mention an OpenR Link screen that freezes or goes black, loss of navigation, dropped Bluetooth and cascades of warnings, often resolved with updates.
- Low severityFrequency: OccasionalBodywork and interiorCharging connector flap fault on the Mégane E-TechAccording to the fiches-auto.fr profile, there are testimonies of a charging connector flap that opens and closes by itself, or gets stuck without closing; the profile mentions a campaign during servicing, without detailing its scope.
In their engines
- Medium severityFrequency: OccasionalRenault-Nissan CMF-EV (Mégane E-Tech, Ariya)Charging faults on the Mégane E-Tech: on-board charger, fast charging and connectorOn the fiches-auto.fr entry, charging is the most frequently reported fault in the electrical system of the Mégane E-Tech: 20 of 86 reports describe charging that stops or is rejected on AC (22 kW charger) or on fast charging, with warnings that charging is impossible.
- Medium severityFrequency: OccasionalRenault-Nissan CMF-EV (Mégane E-Tech, Ariya)Campaign 0EKN: connector in the battery cooling circuit of the Mégane E-Tech that may corrodeIn April 2025 Renault warned owners of the Mégane and Scénic E-Tech that a connector could corrode and leave the traction battery uncharged or limit power. The free repair consists of inspecting the connector and replacing the end of the battery cooling pipe. The information comes from owner forums that cite the manufacturer's letter.
- High severityFrequency: RareRenault-Nissan CMF-EV (Mégane E-Tech, Ariya)Mégane E-Tech traction battery: warnings, range loss and immobilisationThe fiches-auto.fr entry records 11 reports of traction battery problems on the Mégane E-Tech, including warnings, very reduced range, unbalanced modules and a few cases of cars immobilised. It is a sample of owners, without a degradation study or a recall that confirms it.