Re: Codes after water pump replacement. Need help please!
Now why did you not ask about the problems involved in changing the water pump before you started?
This issue you have reported and have asked help upon has been reported by me in posts on this as warning.
To repeat!~ The water pump being vacuum operated has sucked coolant into the vacuum control system going back as far the vacuum pump itself and might have even been discharged into the engine pan where water/coolant and engine oil don't go well together.
There is an MB bulletin on this as vacuum problems affecting the turbo, waste-gate & EGR valve throwing the codes you have published.
First it is recommended you remove the front cover and replace the vacuum hook pipe and O ring that feeds the water pump clutch control .
Most likely you will need to change out the vacuum line part# 9064300331 & change over valve 0025407097, this line contains a hidden check valve which gets contaminated with coolant.
The system MUST maintain & hold a minimum of 23" HG,
Additionally you must check the change over valve & switch & line from the vaccum pump to booster
Not an easy job, you might want to consult a dealer or very good Independant to resolve this.
The last "superdooper faulted head scratcher job we did like this ended up being $4000 to put right .
Dennis
mega.nz
