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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 P0172: BMW DTC 118402; DME -- System Too Rich (Bank 1) >> Fault description

Fault description

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Diagnosis monitors oxygen sensor emissions control. The mixture is too rich and oxygen sensor emissions control makes it leaner.

Fault monitoring conditions:

The fault is detected whenever the mixture is made 30% leaner for longer than 30 seconds.

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