Dyno sheets posted on a defunct French racing site claimed the DF357 produced in naturally aspirated form. By 1980 standards, in a lightweight Renault 5 Shell, that would have been nuclear.
ABS magnetic rings or wheel speed sensors can deform or experience magnetic field degradation when subjected to heat radiated from the brake discs. Common Symptoms Accompanying DF357 Hot
: On automatic or Continuously Variable Transmission (CVT) models like the Renault Megane 2.0L CVT , the transmission control unit uses wheel speed data to manage shift patterns. A missing signal can cause jerky shifting or force the car into a limited "limp mode".
The DF357 relies on a viscous (silicone) fan clutch. When these fail, the fan spins at 20% of its required speed. You won't hear the "roar" of the fan when the engine gets hot. Without that roar, the engine bay becomes an oven. renault df357 hot
: The vehicle forces a restricted, low-RPM mode to prevent unintended acceleration.
In modern Renault platforms (such as the ), control units like the Engine Control Unit (ECU), Electronic Stability Program (ESP/ABS), and Transmission Control Unit (TCU) continuously share high-speed data over a multiplexed CAN-bus network.
Verify your battery is holding a charge above 12.4V and that terminals are tight and clean. Dyno sheets posted on a defunct French racing
The DF357’s original engine was modest — an air-cooled four-cylinder built for reliability, not speed — but this particular example had an aftermarket history. In the 1960s a private mechanic had fitted larger carburetors, a lightened flywheel, and a custom exhaust that let the engine breathe better. Those changes gave the DF357 the kind of spirited throttle response that made it “hot” among local enthusiasts: quick off the line, lively in the bends, and with a bark from the tailpipe that announced itself before headlights did.
: Modern Renaults are notoriously sensitive to voltage. A weak battery can cause "ghost" codes like DF357 in the transmission module.
However, the legend lives on. A handful of replica DF357 "Hot" specs have been built by privateers using rare Gordini cylinder heads and custom cranks. If you ever see a Renault R18 with side-exit exhausts and a suspiciously lumpy idle at a French classic car meet, walk over and listen closely. If it sounds like a BMW M3 on espresso, you might have just found the ghost of the DF357. Common Symptoms Accompanying DF357 Hot : On automatic
The of your Renault (e.g., Megane III, Clio IV, Grand Scenic).
If the code breaks down communication to your cruise control or stability systems:
Electrical resistance increases proportionally with temperature. A wiring harness with a minor nick, corrosion, or a loose pin might pass continuity tests when cold. However, when exposed to high radiant heat from the brakes or engine, the internal resistance spikes. This dampens the low-voltage multiplex signal, resulting in data packet loss on the CAN-bus. 3. CVT and Transmission Fluid Thermal Stress