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B1121
System
Supplemental Restraint (Airbag)
Scanner som krävs
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.

Vanliga symptom

  • Airbag light on

Typiska orsaker

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

Vilken scanner behöver du?

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

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade TOPDON-scannrar

Vanliga frågor

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.