Mercedes E220d W213 NOx Sensor and SCR Catalyst Fault
Mercedes-Benz
E-Class
2016
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
NOx sensor failure on W213 E220d triggers AdBlue warnings and eventually a start countdown. If the NOx sensor is not replaced promptly the SCR catalyst can be damaged by incorrect AdBlue dosing. Sensor: £200-400; SCR catalyst if damaged: £800-2,000.
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 2016 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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