Hi, I need help, i have numerous fault code on my Astra G 1.8 16v,

0335 Crankshaft positon sensor circuit malfunction (new one Installed)

0403 egr curcuit malfunction (new one fitted today and still a fault)

1405 DPFE sensor upstream hose off of unplugged ( Where is this Located?)

1612 sbds Interactive codes (what is this?)

im at my wits end and need advice please.

Thanks in advance Chris