Good morning!" I have a 207 Turbo Petrol engine 5FX year 2006 115Kw that has the fan that starts when I switch off the engine, as a result the customer finds himself without a battery, has already replaced the water temperature sensor and the fan control relay.

the DTCs still present are these

P0139 lambda consistency

P0054 Lambda probe resistance

P0140 Lambda probe signal

P2279 supplier defect code

P0562 voltage too low 

do you have any tips for diagnosis?

Thank you kind regards Raphael