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Home >> BMW >> 2014 >> 328d >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Self Diagnosis - Diagnostic Trouble Codes (N47 & N57, Diesel) >> Fault Code Tests >> DTC P0420: BMW DTC 180001; DME -- Catalyst System Efficiency Below Threshold (Bank 1) >> Action in service

Action in service

Consequential fault, rectify faults relating to the following components or functions:

Check exhaust system for leak tightness.

Renew the catalytic converter if the fault was entered multiple times or applies constantly.