: If the oxygen sensor heater fails, the engine may take longer to enter "closed-loop" mode, burning more fuel. Rough Idling
: Frequently seen in petrol models like the Megane II, this code indicates a fault in the heater element of the downstream (post-catalytic converter) oxygen sensor .
is defined by Renault as: "Injector control circuit fault – cylinder N open circuit or short circuit to earth/positive."
On modern Renault vans, DF083 can indicate an incorrect signal from the Stop-Start module. Glow Plug/Ignition (Older Diesel):