Renault 4 E-Tech 40 kWh Mk1

Inherited from the Renault 5, the 4 E-Tech can enter deep sleep mode when plugged into third-party smart chargers that control charging via PWM signal (notably Ohme, but also others). When the charger turns off the PWM signal between sessions, the car does not respond when the signal resumes, causing overnight scheduled charging to fail. Owners report the car waking and sleeping repeatedly, which can also stress the 12V battery over time. Renault released a software update that resolves this issue for most owners. When buying used, verify the car has the latest software version and test charging overnight with your home charger. If the update has not been applied, a Renault dealer can install it at no cost.

Like most EVs, the Renault 4 relies on a 12V auxiliary battery to power computer systems and wake-up functions. Connected services and the My Renault app periodically wake the car, creating a parasitic draw. If the main battery drops below approximately 20%, the car stops recharging the 12V system, accelerating the drain. After 2-3 weeks of inactivity, the 12V battery may be too flat to start the car even if the main battery has charge. Renault schedules 12V battery replacement every 4 years, but usage patterns (frequent short trips, long standing periods) can shorten this. The battery costs around €80-150 for the part plus €50-100 for dealer fitting. Keeping the car plugged in during extended parking prevents the issue.

Renault issued recall 0F49 affecting Renault 4 and 5 vehicles produced between 12 December 2025 and 28 January 2026. A production anomaly at the battery cell supplier's plant can lead to delamination of the anode, where electrode material detaches and may damage the current collector and separator. This could cause an internal short circuit, leading to charging errors, overheating, or in a worst case a fire. This is a supplier manufacturing defect affecting a narrow production window, not a design flaw in the battery itself. Renault replaces affected battery modules at no cost. Always verify recall completion with a Renault dealer using the VIN before purchasing a car from this production period.

The Renault 4 uses the OpenR Link infotainment system running on a Qualcomm Snapdragon chipset with Google built-in services. Early Renault EV models using this system (Megane E-Tech, Scenic E-Tech, R5) have reported occasional screen freezes, grey/blank reversing camera feeds, and dropped wireless CarPlay or Android Auto connections. Renault addresses these progressively through over-the-air (FOTA) software updates. Update 3.5.0 specifically addressed camera grey-screen issues and multimedia stability. In most cases a system reset resolves temporary freezes. Hardware failure of the head unit is uncommon but would cost €800-1,200 to replace (likely covered under warranty on cars this new).

The Renault 4 uses a heat pump for cabin heating, sharing the refrigerant circuit with the air conditioning system. Renault EVs have a documented history of refrigerant leaks through aged rubber seals (well known on the Zoe, occasionally on the Megane E-Tech). The R4 uses a newer generation system, but the risk persists as seals age. Symptoms include reduced heating output in winter and weak AC performance in summer. A refrigerant recharge costs €100-200 and resolves many cases. If seals need replacement, costs rise to €300-500. Full compressor replacement runs €600-1,000. Given the car's newness, this has not been reported on the R4 specifically, but it is a known Renault EV pattern worth monitoring as cars accumulate age and mileage.