Image available on the official notice.
Passenger car (Mercedes-Benz S550 and others) - Repair
Official notice
21 Nov 2019
Last checked
27 Oct 2026
An official CAA Japan notice concerns Passenger car (Mercedes-Benz S550 and others) - Repair. On-board diagnostic system (engine control unit) defect. ■ Defective part (component name): On-board diagnostic system (engine control unit). ■ Condition of the structure, equipment or performance deemed noncompliant with standards, and its cause: Incorrect instructions specifying the engine control unit control program to be installed in the vehicle may cause misfire detection diagnostics to operate incorrectly. Consequently, the engine warning light (MIL) in the instrument panel may illuminate even though no malfunction has occurred, and combustion in the falsely identified cylinder may be suspended. In the worst case, exhaust emissions may exceed the prescribed limits. Published 2019-11-21.
What to do now
(Recall) 外-2950 ■ Corrective measures: Reprogram the engine control unit with the corrective control program on all vehicles.
Recall number
外-2950
Official notice
2019-11-21
The hazard
The hazard
On-board diagnostic system (engine control unit) defect. ■ Defective part (component name): On-board diagnostic system (engine control unit). ■ Condition of the structure, equipment or performance deemed noncompliant with standards, and its cause: Incorrect instructions specifying the engine control unit control program to be installed in the vehicle may cause misfire detection diagnostics to operate incorrectly. Consequently, the engine warning light (MIL) in the instrument panel may illuminate even though no malfunction has occurred, and combustion in the falsely identified cylinder may be suspended. In the worst case, exhaust emissions may exceed the prescribed limits.
How to check if you're affected
How to check if you're affected
Compare the product name and identifiers below with the item you own. Check the official notice for the affected products and next steps.
Recall Numbers
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Affected products
Product 1
Hazard
Where it was sold
Where it was sold
Retailer information is not currently available in RecallScope. Check the official notice for distribution details.
Location 1
Affected area 1
Company & contacts
Company & contacts
Brand: Mercedes-Benz. Contact: メルセデス・ベンツ日本株式会社. Phone 0120-086-880.
Source & status
Source & status
Recall details
Recall details
Recall number
Event id
Source tier
Documents, notices & source
See the official notice and source documents for full details.
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