Resetting check engine light Volvo 740/940

INFO: Applies only for Bosch LH 2.4 Petrol engines.
  1. Place diagnostic wire in socket A2.
  2. Turn on ignition.
  3. Press and hold diagnostic button for 5 seconds (not less).
  4. Wait three seconds. Diagnostic diode will turn on.
  5. Press and hold diagnostic button for 5 seconds (not less).
  6. Diode will turn off.
  7. Turn off ignition.

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