News Channel Update |

Vehicle Compliance & Analysis

ATTENTION: Mercedes-Benz Dealer Principals, General Managers, Sales Managers, Service Managers & Parts Managers

Emission Service Campaign Notification
April 01, 2026

Campaign # / CA DMV #

Description

2026010005 / 260105

23P5498620

Update Engine Control Unit
Campaign Details

Total Population 2,654

Model(s)/
Platform(s)

Model Year(s) 2021-2023

CLA, GLA (118, 247)

Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain
subject vehicles equipped with M139 gasoline engine, the nozzle geometry of the exhaust turbocharger
Issue might not meet specifications. This could affect exhaust flow in certain load/rpm ranges and increase
NOx emissions, potentially causing the vehicle to exceed emissions regulatory limits.
Remedy

MBUSA will conduct an emission service campaign. An authorized Mercedes-Benz dealer will update
the engine control unit software on the affected vehicle.

Launch Date Affected VINs will be flagged as “OPEN” in VMI on April 03, 2026
Warranty Claim Notice

Please note the campaign will close after the claim has been submitted. This change can take at
least one-day to reflect in NetStar VMI.

Notice to California Dealers: As required by 13 CCR 2117, a proof of correction (“POC”) certificate showing that the vehicle has
been repaired under this recall must be issued by the authorized service facility, and that such a certificate may be required by
California as a condition of vehicle re-registration or operation. Please reference this POC in the attached work instructions.
Failure to complete this step may result in fines and penalties and lead to customer dissatisfaction.

While we regret any inconvenience this may cause, MBUSA is determined to maintain a high level of vehicle quality and
customer satisfaction. Please refer all customer inquiries to the Customer Care Center at 1-800-FOR-MERCEDES.

Mercedes-Benz USA, LLC
One Mercedes-Benz Drive

A Mercedes-Benz Group AG Company

Sandy Springs, GA 30328

770.705.0600

April 2026
Rev. January 31, 2025
TO:

ALL MERCEDES-BENZ DEALERS

CAMPAIGN NO.

2026010005

CAMPAIGN DESC.

23P5498620

CA DMV #

260105

SUBJECT

Update Engine Control Unit

MODEL(S)

CLA and GLA (118 and 247 platform)

MODEL YEAR(S)
CAMPAIGN POPULATION

2021 – 2023

Emission Service Campaign

Emission Service Campaign

Emission Service Campaign

2,654

Prior to performing this Campaign:
Check the Vehicle Master Inquiry (VMI) to verify this campaign applies to the specific vehicle.
1. Always check for other open campaigns and perform them accordingly!
2. Review the entire campaign bulletin first, and perform the procedures exactly as described.
California registered vehicles require a Proof of Correction Label and Certificate, according to California Code
Regulation Title 13, § 2117 – Proof of Correction Certificate.
Non-California dealers may perform the remedy on California registered vehicles, however, please direct
those customers to visit their preferred California dealership to receive the Proof of Correction Label and the
Certificate after the recall has been completed.
Revision Note(s):

Order No. P-SC-2026010005

Emission Service Campaign

Emission Service Campaign

Emission Service Campaign

Campaign Technical Instructions

2

EMISSIONS SERVICE CAMPAIGN - UPDATE ENGINE CONTROL UNIT

Model(s): 118 and 247
• Always use the latest XENTRY Diagnosis software release with all available add-ons.
• Follow the operation steps exactly as described in XENTRY Diagnosis.
• Use a charger to ensure sufficient power supply to the vehicle’s on-board electrical battery system
(greater than 12.5 V).
• If XENTRY Diagnosis is already connected to the vehicle, start with Work Procedure Step 2.
If two or more software updates or SCN codings are performed during a single workshop visit, operation items
02-4762 and 02-5058 may be invoiced only on one of the workshop orders.

Work Procedure
1. Connect XENTRY Diagnosis.
2. Update Engine electronics (ME) control unit software.
To do so, select menu item "Quick test view → N3/10 - Engine electronics 'MRG1AMGR4' for combustion
engines ‘M139’ (ME) → Adaptations → Control unit update → Updating of control unit software".
Then follow the user guidance in XENTRY Diagnosis.

3. Disconnect XENTRY Diagnosis.

Warranty Information
Note: The following allowable labor operation should be used when submitting a warranty claim for this repair:
Damage

Operation

Code

Number

54 986 20

*

Description

Labor Time
(hrs.)

02-9334

Update Engine electronics (ME) control unit software.
(XENTRY Diagnosis connected)

0.1

02-4762**

Connect/disconnect diagnosis system
(XENTRY Diagnosis)

0.1

02-5058**

Connect/disconnect starter battery charger
(XENTRY Diagnosis connected)

0.1

Invoice operation item only once for each workshop Repair Order.

Note: Always check Xentry Operation Time (XOT) for the current OP-Code times. Labor times are subject to change
and updates may not be reflected in this document.

1

P-SC-2026010005

3

EMISSIONS SERVICE CAMPAIGN - UPDATE ENGINE CONTROL UNIT

Model(s): 118 and 247

The following step applies to California dealers only.
Apply Proof of Correction Label (A 000 584 54 13) to area identified in Figure 1. Fill in the blank areas of the label. The
“Campaign No.” for the California Proof of Correction is unique and must be entered as such (260105), your “Dealer
Code”, and the “Date” of the repair, using a black permanent marker.
Note: Clean bonding surface prior to affixing label.

Figure 1
The following step applies to California dealers only.
Provide the owner with the completed and signed Proof of Correction Certificate (A 000 584 42 14) (Figure 2), after you
scan a completed form and attach to the RO. The recall number for the California Proof of Correction Certificate is unique
and must be entered as such (260105).

Figure 2
California Proof of Correction Parts Information
Qty.

Part Name

Part Number

1

Proof of Correction Certificate (CA Dealers Only)

A 000 584 42 14

1

Proof of Correction Label (CA Dealers Only)

A 000 584 54 13

Warranty Information (California dealers please submit claim on a separate line of the same RO as the campaign)
Damage Code

Operation

Description

Labor Time
(hrs.)

Apply Proof of Correction Label and completed Proof of Correction
Certificate

0.1

Number

212CA 00

02-0001

P-SC-2026010005