Mercedes All Models AdBlue Incorrect Fluid Top-Up Damage
Mercedes-Benz
C-Class
2015
All Euro 6 diesel
⚡ Quick Summary
Severity Level
High
Safe to Drive?
✅ Safe to Drive
Safety Impact
No direct safety impact reported by owners
Urgency Level
🟠 Fix Soon
Accidentally filling the AdBlue tank with diesel or other fluid causes immediate and severe damage to the SCR catalyst and injection system. The tank must be drained and flushed immediately — do not start the engine. Total repair cost if SCR catalyst is contaminated: £800-2,500.
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 2015 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
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