B1121
Sistema
Supplemental Restraint (Airbag)
Escáner necesario
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Driver Airbag Squib 2 Circuit

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

Second squib circuit for dual-stage driver airbag.

Síntomas habituales

  • Airbag light on

Causas típicas

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

¿Qué escáner necesita?

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

Use datos en vivo y freeze frame antes de cambiar piezas. Códigos ABS, SRS y U suelen requerir un escáner de todos los sistemas.

Consejos de diagnóstico

  • Registre el freeze frame cuando se active el código
  • Borre el código solo tras corregir la causa
  • Revise códigos pendientes relacionados
  • Verifique que la batería esté por encima de 12,4 V antes de sospechar sensores

Escáneres FOXWELL recomendados

Preguntas frecuentes

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.
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.