Mercedes P2004 Intake Manifold Runner Stuck Open
Mercedes-Benz
E-Class
2009
OM651 2.2 CDI
⚡ Quick Summary
Severity Level
Medium
Safe to Drive?
⚠️ Drive with Caution
Safety Impact
Indirect risk — worth monitoring, not urgent
Urgency Level
🟡 Monitor Closely
P2004 on OM651 Mercedes diesel indicates the intake swirl flap is stuck in the open position. Actuator shaft shear is the most common cause. P2004 (open) is less immediately dangerous than P2015 (position sensor) but still indicates actuator failure requiring attention.
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.
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