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4 faults documented by at least two sources, listed by version then by mileage at onset when known.
4 known faults
The 1.2 TCe (H5Ft) of the early Mégane IV can consume oil because of its piston rings: according to Car Verif, citing L'argus, engines built up to 11 May 2016 are affected. Que Choisir reports many cases on this engine, some leading to engine failure. Check the engine's manufacturing date and measure oil consumption.
The release button on the EDC gearbox selector knob can crack and then break: it then becomes impossible to engage a gear and the car is immobilised. According to Motor1 (citing L'argus), Mégane 4 vehicles built before 11 May 2018 are affected; the only remedy is replacing the knob, which Renault agrees to do on request (no recall).
The release button on the EDC gearbox selector knob can crack and then break: it then becomes impossible to engage a gear and the car is immobilised. According to Motor1 (citing L'argus), Mégane 4 vehicles built before 11 May 2018 are affected; the only remedy is replacing the knob, which Renault agrees to do on request (no recall).
Out of 14 Mégane IV 1.3 TCe examined between 70,000 and 130,000 km, Car Verif found 7 clutches worn prematurely, at an average cost of 800 to 1,200 euros. On the Que Choisir forum, owners of manual 1.3 TCe models (Mégane 4, Scénic, Captur) describe a spongy pedal, friction and squealing when warm.
Out of 14 Mégane IV 1.3 TCe examined between 70,000 and 130,000 km, Car Verif found 7 clutches worn prematurely, at an average cost of 800 to 1,200 euros. On the Que Choisir forum, owners of manual 1.3 TCe models (Mégane 4, Scénic, Captur) describe a spongy pedal, friction and squealing when warm.
Out of 14 Mégane IV 1.3 TCe examined between 70,000 and 130,000 km, Car Verif found 7 clutches worn prematurely, at an average cost of 800 to 1,200 euros. On the Que Choisir forum, owners of manual 1.3 TCe models (Mégane 4, Scénic, Captur) describe a spongy pedal, friction and squealing when warm.
On the Mégane E-Tech plug-in, owners report repeated 12 V battery failures (the car will no longer unlock or start) and cuts in the 12 V circuit with a "Electrical fault" message, dealt with through software updates and battery replacement.
Sources
No recurring fault documented for: Blue dCi 115.
An OBD scanner plugged in under the steering wheel shows stored fault codes, even with warning lights off: useful during the test drive.
Compare prices of parts for the Renault Mégane IV (timing, brakes, filters) to estimate the repairs to plan for.