⚠️ Important Notice

By accepting, you confirm you have read and agree to our Terms of Use and Privacy Policy.

Your IP address and browser information will be recorded as proof of this acknowledgement. This data is retained for 12 months.

Mercedes W212 E-Class OM651 EGR Valve Carbon Fouling — Mercedes-Benz E-Class 2009 | MyCarFault
⚪ UNSOLVED No confirmed fix yet · Be the first to help

Mercedes W212 E-Class OM651 EGR Valve Carbon Fouling

Mercedes-Benz E-Class 2009 OM651 2.2 CDI
On This Page: 🔧 All Repairs ⚠️ Avoid These 🔗 Similar Faults
⚡ Quick Summary
Severity Level
Medium
Safe to Drive?
🚫 Do NOT Drive
Safety Impact
Direct safety risk — affects safe operation of the vehicle
Urgency Level
🟡 Monitor Closely

The OM651 diesel engine in W212 E-Class accumulates carbon on the EGR valve and passages. The valve sticks partially closed or open, causing P0400 codes, limp mode, rough idle and black smoke. Cleaning resolves most cases; replacement needed if the valve actuator has failed. The EGR cooler should be inspected simultaneously.

Repair / Solution

No confirmed fixes yet. Share yours below.

⚠️ Wrong Diagnosis?

No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Mercedes-Benz E-Class 2009 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.

🚗 More About This Vehicle

📋 All Mercedes-Benz E-Class fault reports → 🚘 All Mercedes-Benz fault reports → 🔧 Browse all fault reports →
Explore more Mercedes-Benz models
Mercedes-Benz C-Class 29 Mercedes-Benz Sprinter 27 Mercedes-Benz GLC 25 Mercedes-Benz A-Class 25

Help other owners by sharing your experience.

Your real-world fix helps thousands of drivers worldwide. Takes 2 minutes.

✅ Submit a Fault ❌ Wrong Diagnosis?
🔧
Usta
● Online