Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Control Module (N3/10) Flashing (54.21/244A)
Reference number: 54.21/244A
Supersedes refnos: 07.61/89A
ENGINE CONTROL MODULE (N3/10) FLASHING
TECHNICAL SERVICE BULLETIN
| MERCEDES-BENZ: | MY-All, Models All |
| GROUP: | 07 - Mixture formation, 54 - Electrical system, equipment and instruments |
SUBJECT
MY-All, Models All
Engine Control Module (N3/10) Flashing
Do not flash the engine control module (N3/10), unless specifically instructed to do so in a technical document, such as a LI, Service Bulletin, Campaign, or Diagnostic Tree; or the SDS Diagnostic System indicates to do so.
Failure to adhere to this policy will result in rejected warranty claim or a debit. Unnecessary flashing could have an adverse effect on vehicle functionality.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.