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July 2, 2026 Service bulletin

CEL light on with no drivability concerns

Mercedes-Benz technical service bulletin LI54.21-P-080326 for 2020-2026 Mercedes-Benz CLA250, 2020-2024 Mercedes-Benz GLE 350 and 2021-2026 Mercedes-Benz GLA 250 and others.

Bulletin number
LI54.21-P-080326
Component
Engine
Summary
Complaint CEL light on with no drivability concerns. Cause Signal timing error. Remedy 167: SW has been released. Update the FSAM to the latest SW version. 465, 290, 118, 243, 247: Software is still in development. This fault code does not cause a drivability concern and will clear itself within 2-3 key cycles. The vehicle can be released back to the customer.

Owners of these vehicles have filed 196 complaints in the engine category.

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