Mercedes C300 W206 4Matic 2.0T MHEV Annual Guide
Mercedes-Benz
C-Class
2021
M254 2.0T 258PS MHEV
⚡ Quick Summary
Severity Level
Medium
Safe to Drive?
✅ Safe to Drive
Safety Impact
No direct safety impact reported by owners
Urgency Level
🟡 Monitor Closely
C300 W206 4Matic at 100,000 miles: 48V EQ Boost battery check, M254 timing chain oil frequency, 4MATIC transfer case fluid and 9G-Tronic fluid service.
Onarım / Çözüm
No confirmed fixes yet. Share yours below.
⚠️ Yanlış Teşhis mi?
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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