✅ Fixed
Replaced all spark plugs with NGK iridium plugs. One coil pack was also weak — replaced. Smooth idle restored immediately.
Mercedes-Benz S-Class 2019 P0300 random misfire rough idle
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🔍 Symptoms
⚙️ Causes
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⚡ Quick Summary
Severity Level
High
Safe to Drive?
⚠️ Drive with Caution
Safety Impact
Can become a safety issue if left unresolved
Urgency Level
🟠 Fix Soon
Mercedes-Benz S-Class 2019 P0300 random misfire detected. Engine shaking at idle. Check engine light on. 30104 km. This fault code is stored when the engine control unit detects a specific fault condition. Common causes include sensor failures, wiring faults, and component wear. Always read additional fault codes before replacing parts — multiple codes together provide a clearer diagnosis. Clear the code after repair and test drive to confirm the fault does not return.
🔍 Symptoms
📍 P0300 — random misfire causing rough idle
📍 Mercedes-Benz S-Class
⚠️ P0300 fault code
⚙️ Possible Causes
Fault code P0300 detected
P0300 — random misfire causing rough idle
Mercedes-Benz S-Class
Possible: Replaced all spark plugs with NGK iridium plugs. One coil pack was also weak — replaced. Smooth idle restored immediately.
Repair / Solution
Based on 141 driver confirmations
⚠️ Wrong Diagnosis?
No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Mercedes-Benz 2019 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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