Hi, I have a 2009 Grande Punto 1.9 Multi-jet. Just recently it has developed an intermittent starting issue. At first it would display an error "Excessive Radiator Temperature", so we replaced the engine temperature sensor. The problem went away for about 10 days but has now returned! The message isn't displayed anymore but the starting issue is weird. From overnight/cold the car starts on the button. I drive 5 or 6 miles park up for a short period of time. Get back in and then non starting issue returns. Diagnostics have now said P2626 error code Lambda Sensor Electrical Diagnosis. The engine temperature dial intermittently goes right to the top???? Does anyone have any ideas please? Thanks 
