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B1121
Systeem
Supplemental Restraint (Airbag)
Scanner vereist
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Driver Airbag Squib 2 Circuit

Understand B1121, common causes, and the right TOPDON scanner to diagnose it.

Second squib circuit for dual-stage driver airbag.

Veelvoorkomende symptomen

  • Airbag light on

Typische oorzaken

  • Dual-stage bag module fault
  • Clock spring secondary circuit
  • Connector under column

Welke scanner heb je nodig?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Gebruik live data en freeze frame voordat je onderdelen vervangt. ABS-, SRS- en U-codes vereisen meestal een full-system scanner.

Diagnosetips

  • Leg freeze frame vast wanneer de code voor het eerst verschijnt
  • Wis de code pas na het oplossen van de oorzaak
  • Controleer op gerelateerde pending codes
  • Controleer of accuspanning boven 12,4 V is voordat je sensoren suspecteert

Aanbevolen TOPDON scanners

Veelgestelde vragen

What does B1121 mean?
B1121 indicates driver airbag squib 2 circuit. Second squib circuit for dual-stage driver airbag.
Can I diagnose B1121 with a basic code reader?
B1121 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for B1121?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with B1121?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.