EGR/Throttle Control engine coded

[Valhalla29]

Hi,

Been having issues with my DS5 2015 2.0HDI.

It threw up codes and was told it was an EGR valve causing it by a mechanic but couldn't get anywhere to look at it. Replaced it myself and before hand was showing p0488 code on a generic code reader

The fault has persisted and now managed to plug it into diagbox and pulled p1498 and p0488 again but they relate to air mixer unit and too closed.

Will this be the throttle body rather than EGR fault? Just looking for any hints and tips before I pull it apart again or give up and send it off somewhere to be sorted

Thanks

[Valhalla29]

Further to the above, checked and found a plastic clip loose linking to the air pipe. Sorted that and that cleared that problem however the drama doesn't stop!

Now receiving the following only under acceleration above 3krpm P0100 P2566 P11AA P1496. Also can hear a woosh of air on acceleration then drops into restricted performance mode until I clear the fault and normal driving is resumed

Anyone any hints on where to go from here?

Thanks