Vehicle recall R/2021/402

Mercedes-Benz A-Class and Mercedes-Benz B-Class recall: Update to the diesel engine control unit software to improve the emissions

DVSA recall R/2021/402 names the Mercedes-Benz A-Class and Mercedes-Benz B-Class. It was launched 13 December 2021. It covers vehicles built 29 June 2012 to 5 July 2013.

Recall data updated 22 September 2026

Recall: R/2021/402
Launched: 13 December 2021
Issued by: MERCEDES-BENZ CARS UK LTD
Manufacturer reference: SRPC2156
Vehicles: DVSA lists 31,414 on each model line

What can go wrong

As a result of a directive from Germany’s Federal Motor Transport Authority (KBA) changes are required to certain specific calibration functions within the engine management systems of certain vehicles.

The fix

Conduct an update to the diesel engine control unit software.

Models and build dates

As listed in the DVSA recall file. DVSA lists the same vehicle number on each line: 31,414. It may be a figure per line or for the whole recall.
Model	Built	Vehicles
Mercedes-Benz A-Class (A CLASS(176))	29 June 2012 to 5 July 2013	31,414
Mercedes-Benz B-Class (B CLASS (246))	29 June 2012 to 5 July 2013	31,414

Is a specific car affected? A recall lists models and build dates, not individual vehicles, so these pages cannot tell you whether one car is included. Enter the registration on the DVSA vehicle recall checker on GOV.UK, or give the vehicle identification number (VIN) to the manufacturer or one of its dealers. Buying used? Ask the seller for proof that any recall work was done.

Other recalls for these models

R/2021/399 Update to improve emissions 13 December 2021, Mercedes-Benz B-Class, Mercedes-Benz A-Class
R/2021/108 The behaviour of the emergency call system might not meet specifications 1 December 2021, Mercedes-Benz E-Class, Mercedes-Benz GLE, Mercedes-Benz GLS and others
R/2021/376 The behaviour of the emergency call system might not meet specifications 29 November 2021, Mercedes-Benz CLA, Mercedes-Benz E-Class, Mercedes-Benz GLA and others
R/2021/401 The corrosion protection of the high voltage battery housing might not be ensured over the lifetime of the vehicle 11 January 2022, Mercedes-Benz A-Class
R/2021/437 Locking pawl spring of the left hand side door locks might not be greased correctly 14 January 2022, Mercedes-Benz CLA, Mercedes-Benz A-Class, Mercedes-Benz GLA
R/2021/292 Software update to improve emissions 29 October 2021, Mercedes-Benz A-Class

Found one you might buy?

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Source

Contains public sector information licensed under the Open Government Licence v3.0. Source: DVSA vehicle recall records (RecallsFile.csv), recalls launched 1992 to 2026. Recall data updated 22 September 2026.

Recall wording is DVSA's, with capitals and punctuation tidied and American spellings such as tire, center and windshield given in British English. We list a recall when its make and model match a car or van family with at least 1,000 DVSA MOT tests from 2022 to 2025, and when the maker of the vehicle issued it.

Not affiliated with or endorsed by DVSA. Methodology · Data sources