Hi there can anyone help me I have a 57 Audi a3 sport back 20 tdi 140 bhp my car goes in limp mode when I go on the motorway and the car goes over 80 but when I turn key of the on it sorts it self out for a bit then does it again I ve pluged it in and it comes up with a code p0234 engine boost condition-limits exceeded I would be grateful for and info or help thanks
andy
andy