In some older Renault models (like the Laguna II or Megane II), the ECU software might need an update to calibrate how the temperature signal is interpreted, though hardware failure is more likely.
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. renault df357 hot