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Old 06-25-2002, 02:12 PM
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Join Date: Aug 2001
Location: Ohio
Posts: 183
96 C280 EGR Scan Code #P0400


I just pulled the OBDll scan code for the 96 C280 and it returned a P0400 (Exhaust Gas Recirulation Flow). Is this the code for a defective EGR valve?

Any information will be appreciated.

Martineau Gauda

96 C280 Mercedes
82 Rolls Royce Silver Spur
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Old 06-25-2002, 02:47 PM
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,503
It could be a defective EGR valve, or could be indicating low EGR flow.

A common problem with these M104 engines is that the hot inlet pipe to the intake manifold gets clogged up from the EGR vapors.

Steve Brotherton mentions this in an article posted on this site.

Click on D.I.Y. at the top of the screen, and click on the link for Evaluating Diagnostic Engine Controls to read about the problem and the solution.
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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