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Home >> BMW >> 2013 >> 335i 2D Convertible, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Self Diagnosis - N55 - Diagnostic Trouble Codes - DTC P0478 (BMW DTC 138101) Through DTC P0440 (BMW DTC 191D01) >> DTC P0420; BMW DTC 180001: Catalytic converter: efficiency below limit value >> Condition for fault identification

Condition for fault identification

Test condition:

The fault is recognized when the catalytic converter loses the ability to store sufficient levels of oxygen.

Potential problem source(s):

Terminal condition: none

Voltage condition:

Temperature condition:

Time condition:

Other conditions: