I'd get the first issues you asked about figured out first and then play with the egr vlave later after its running right again.

The engine compartment computer link is for MB's SDS laptop. SDS will read all subsystems in the car. OBDII mainly reads engine codes that cause emmission faults.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)