PeachParts Mercedes-Benz Forum - Pictorial DIY: M104 - EGR vacuum line replacement

If your CEL is on and a code P0400 is thrown then one of the causes can be that ...

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vac is not getting to the egr and on a 104 that is usually just a broken white plastic vac line that runs across the front of the engine [ under that front plastic cover]..notorious fault b/c they crack from heat fatique and then the EGR can not open b/c of no vac, thus setting the code.
The simple fix for that is to just to replace that plastic line with a generic rubber one.....a $2 DIYer fix.

Arthur Dalton

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Since everything was open, I replaced the vac line for air injection as a prevention too. Material cost $6.-.