thanks guys, went in the other day and it was the intercooler, seem split it was hard to see. changed and all running spot on

Hi new to this forum as recently bought a 2009 disco 3 4 months ago. All good for 3 months then I started to hear a quiet 'screeching ' like sound when I was slowing down without brakes using gears. After few weeks suddenly engine system fault warning came on and smoking like mad!! No screeching...