2021-2022 BMW Mixture Too Rich Detection TSB

BMW has issued a manufacturer communication, identified by NHTSA ID 10228426, concerning an engine management issue affecting certain 2021-2022 BMW X3, 330e, and 530e models. This communication addresses instances where the vehicle's system may incorrectly detect a BMW mixture too rich condition.

The issue primarily relates to the POWER TRAIN component, specifically how the engine's air-fuel mixture is monitored under certain driving conditions. Owners of affected vehicles should be aware of this potential diagnostic anomaly.

Symptoms

The primary symptom described in the communication is an "incorrect detection of a mixture that is too rich." While the document does not detail specific dashboard warning lights or performance issues an owner might observe, this internal detection could potentially lead to diagnostic trouble codes or other engine-related notifications if not addressed.

Trigger Conditions

This incorrect detection of a BMW mixture too rich is linked to an "unfavorable operating point." This condition is most prevalent when the engine is operating in the "low-end torque range." This suggests the issue may be more noticeable during acceleration from a stop or at lower engine speeds.

What Owners Should Know

This manufacturer communication, NHTSA ID 10228426, indicates a known issue that BMW is aware of. While the document summary does not outline a specific repair procedure or software update, it highlights a diagnostic challenge that technicians might encounter. If you experience any engine performance issues, warning lights, or concerns related to your vehicle's air-fuel mixture, it is advisable to consult with a BMW service center.

Your dealer can check for any relevant service bulletins or software updates that address the "incorrect detection of a mixture that is too rich" condition. Early diagnosis can help prevent potential long-term issues related to engine performance or emissions.

Source: NHTSA ID 10228426