Mercedes C220d W206 OM654 First High Mileage Check
Mercedes-Benz
C-Class
2021
OM654 2.0 CDI
⚡ Quick Summary
Severity Level
Medium
Safe to Drive?
⚠️ Drive with Caution
Safety Impact
Indirect risk — worth monitoring, not urgent
Urgency Level
🟡 Monitor Closely
W206 C220d at 100,000 miles: OM654 EGR inspection, 9G-Tronic fluid service, AdBlue NOx sensor function check and 4MATIC transfer case fluid (AWD variants).
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 C-Class 2021 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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