Did more research and a faulty egr can potentially throw multiple different codes. I cleared the old codes and CEL came on again the next day this time only one code, still relating to DPF restriction or ash accumulation.

It doesn’t always indicate a issue with the DPF itself, so I just ordered another EGR and will see if CEL persists. Faulty/clogged EGR can cause an increase in DPF pressure as ash accumulates due to the car being unable to regenerate properly. I’m still learning more about this engine but hopefully this helps out another w211 diesel owner

 

Very common fault is either DPF sensor or sensor connection tubes clogged. Car is thinking DPF is full even it is not. Same faulty pressure reading may cause car inner diagnostic to think there is problem in EGR because pressure differences do not match/change according EGR control.

 

I’ll check those tubes as well, thanks! So my plan is to install a different egr (mine is likely original) and do a manual regen for now.

Did a lot of digging through different forums and started seeing threads warning of carbon build up inside the EGR tube in the front of the engine and possibly intake manifold. Did this happen to all Bluetec/OM642s or just cars not properly maintained? And is there a way to check this and purge everything out?

 

Finally got the egr off it was stuck like a mf, got it off with rubber mallet and wood chisel. The egr was pretty sooty and the back of the egr fell off as soon as I picked it up. I don’t think it was functioning at all.