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Home >> BMW >> 2016 >> 335i Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 1084 (Self Diagnosis - Diagnostic Trouble Codes (N20 & N26)) >> Fault Code Tests >> DTC P0420: BMW DTC 180001; DME -- Catalyst System Efficiency Below Threshold (Bank 1) >> Fault description

Fault description

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Diagnosis monitors the oxygen storage capacity of the catalytic converter.

Fault monitoring conditions:

This fault code is detected whenever the catalytic converter is no longer able to store enough oxygen.

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