I have had an issue with my '06 Focus 1.6 TDCI for a while.
Several DTC's are detected, but replacing the sensors involved with DTC codes don't do anything.

The codes are:
P0100 Mass/Volum air flow A error
P0102 MAF sensor circuit low input
P0113 IAT Sensor circuit high input

Has anyone experienced other systems that could cause these codes ?
Could it be a problem with the EGR or the DPF system that are causing these codes ?

Any help is much appreciated.