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2004 E500 4Matic
31 Posts
Discussion Starter · #1 ·
Hey all,

My wife has a 97 C230 and the check engine light decided to make itself known about 3 weeks ago. According to the code (PO400), the problem is an EGR System fault where the ECM detected too little flow on the EGR system.

Probable causes were:
1. Blocked passage on EGR system
2. Failed EGR valve
3. EGR solenoid faulty
4. Failed EGR pressure sensor

If anyone has any advice on where to begin or if you've replaced any of these items, I'd apprciate any info you could give me.

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