The Mégane II Owners' Club

Mégane MK2 1.9dci 130 CC
The engine light is on, the service text is on and the display reads check injection.
My code reader shows DF038 computer eeprom fault and DF309 temp sensor open circuit or short to +12v

The car is running perfectly. Speed fine, acceleration fine, fuel consumption 50ish mpg which is normal. Starts and runs as normal.

I have cleaned the EGR valve, the glow plugs are showing +12v when tested. The injection pressure thing is working ok.

I am not sure where the temp sensor thing is.

Any ideas, suggestions etc

I had a DF038 and a couple of other voltage related messages at the same time when I had a flat battery once.
I charged the battery, cleared the codes and it has been fine ever since.
Are your battery and all the main power and earth connections in good condition?