Hello, i new and i have problem with my C5 2003 2.2HDI 98kw, diesel, manual. Turbo pressure goes very high and engine goes limp mode. Week ago, i change turbo with new one. Wastegate working, vacuum pipes not leaking - tested, solenoid tested and tried new one. Diagnostic shows overboost pressure 2500mbar and then limp mode. Old turbo has the same problem. In idle when i press gas pedal, turbo make a loud whistle. Does the clogged EGR valve cause the high pressure? Fault codes: P0235 - Turbo pressure signal; short circuit to positive or value too high P0245 - Turbo pressure; pressure measured too high. Maybe i get help this forum. Sorry, for bad english. Greetings from Estonia!