1990 Mercedes Benz 350SDLFACTORY OEM SERVICE PROCEDURE

Clearing Codes

Disconnecting battery will not erase codes. Each code stored in EDS control unit must be erased individually. After impulse counter readout codes are displayed, repeat sequence to display malfunction code. When code displays, wait 2 seconds and then press START button for at least 6-10 seconds. LED will blink once and/or impulse counter readout will display "=1", indicating code is erased. Continue this sequence until all codes are erased. Disconnect test equipment.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.