NHTSA service bulletin

NHTSA Service Bulletin 11029057: 2020-2022 Mercedes-benz Amg Cla35

Official manufacturer communication context for 2020-2022 Mercedes-benz Amg Cla35, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.

NHTSA service bulletin 11029057 summary graphic for 2020-2022 Mercedes-benz Amg Cla35
11029057NHTSA document ID
Service campaigncommunication type
14affected product rows
90/100quality score

Reviewed June 2026 from NHTSA manufacturer communication and service bulletin records. Carchieve is independent and not affiliated with any vehicle manufacturer or government agency.

Quick answer

Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the control unit software for the engine electronics does not correspond to the current series production configuration. This may cause the electrical fault diagnosis of the lambda sensor to not operate as intended, so that in the event of a fault, the check engine indicator lamp may not illuminate. MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update the software for the engine electronics control unit on the affected vehicles.

What this bulletin may mean before buying

Treat this as service research, not a verdict on one car. Before you buy, compare this communication with official recall campaigns, model-level owner complaint patterns, and the exact vehicle’s VIN-decoded specifications. A bulletin can help you ask a seller or dealer sharper questions about software updates, known repairs, warranty extensions and service history.

Affected products listed in this communication

MakeModelModel yearsBuyer note
Mercedes-benzAmg Cla352020-2022Ask for service records and run the exact VIN before purchase.
Mercedes-benzAmg Cla35 4matic2020Ask for service records and run the exact VIN before purchase.
Mercedes-benzAmg Cla452020-2022Ask for service records and run the exact VIN before purchase.
Mercedes-benzAmg Cla45 4matic2020Ask for service records and run the exact VIN before purchase.
Mercedes-benzAmg Gla352021, 2022Ask for service records and run the exact VIN before purchase.
Mercedes-benzAmg Gla452020-2022Ask for service records and run the exact VIN before purchase.
Mercedes-benzAmg Gla45 S2021Ask for service records and run the exact VIN before purchase.
Mercedes-benzAmg Sl432022Ask for service records and run the exact VIN before purchase.
Mercedes-benzAmg Sl552022Ask for service records and run the exact VIN before purchase.
Mercedes-benzAmg Sl632020, 2022Ask for service records and run the exact VIN before purchase.
Mercedes-benzCla 2502020-2022Ask for service records and run the exact VIN before purchase.
Mercedes-benzCla 250 4matic2020, 2021Ask for service records and run the exact VIN before purchase.
Mercedes-benzGla 2502020-2022Ask for service records and run the exact VIN before purchase.
Mercedes-benzGla 250 4matic2021Ask for service records and run the exact VIN before purchase.

Buyer checklist

  1. Run the 17-character VIN and confirm the year, make, model, engine and equipment match the listing.
  2. Check recall campaign pages for safety actions that may require dealer repair.
  3. Compare this bulletin with common problem pages for the same model and component area.
  4. Ask the seller or dealer whether the bulletin procedure, update or inspection has already been completed.
  5. Use the used-car buying checklist and get an independent inspection.

Frequently asked questions

What is NHTSA service bulletin 11029057?

Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the control unit software for the engine electronics does not correspond to the current series production configuration. This may cause the electrical fault diagnosis of the lambda sensor to not operate as intended, so that in the event of a fault, the check engine indicator lamp may not illuminate. MBUSA.

Is a service bulletin the same as a recall?

No. A recall is a safety campaign with a required remedy for affected VINs. A service bulletin or manufacturer communication usually describes diagnostic, repair, software, warranty or service information.

How should a used-car buyer use this bulletin?

Use it as a research signal. Compare it with recalls, owner complaints, service records, a VIN report and an independent inspection before buying.

Check the exact VIN before you buy

Model-level pages show public safety patterns. A full VIN report helps confirm the exact vehicle, decoded specs, recall applicability and buyer checks.

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