Hi - 98 E300 Turbo Diesel, CEL came on, checked codes
P0400 EGR flow malfuntion

I have had this Check engine light on, I had it reset and then it appeared again the next day. "Check Engine Electronics" appears when i start the vehicle.

appreciate any help understanding causes and fixes.

 

EGR (Exhaust Gas Recycle) blocked or faulty as the code states.
When OPEN this allows exhaust gas into the inlet manifold to REDUCE performance and thus combustion pressure/temp.
CEL Check Engine Light comes on because this causes NOx levels to rise which means that the car will fail its annual inspection.
The light is advising you to take the carto a gargae to have it fixed.

Replace or clean EGR..

Stuart.

 

Hi alexpunsalan,

I wonder how you resolved the problem. I had the same errorcode P0400.

I checked EGR valve and it worked fine (when I applied some vacuum to it). I suspect the control system has some problem that causes error.

Your reply (or anybody's reply whohasexperiencedthe same problem) will be greatly appreciated!

Shelby