B1121
Left Air Bag Satellite Sensor
B1121 is an OBD-II diagnostic trouble code meaning: Left Air Bag Satellite Sensor. Common causes: open or short circuit in the sensor circuit, damage to the sensor itself. Estimated repair cost: $56–167.
Symptoms
- Airbag light is on
- The passive restraint system may not engage in an impact from the left side.
- Error B1121 is stored in the ECU memory
Causes
- Open or short circuit in the sensor circuit
- Damage to the sensor itself
- Corrosion of contacts or connectors
- Wiring Harness Problems
- Malfunction of the main airbag control unit
How to Fix
- Conduct diagnostics of the passive safety system
- Check the integrity of wiring and contacts
- Inspect the sensor for damage
- Replace sensor if necessary
- Clear error codes and check if B1121 returns
Related codes
FAQ
What does the B1121 code mean?
B1121 is an OBD-II diagnostic trouble code that indicates: Left Air Bag Satellite Sensor
What causes a B1121 error code?
The most common causes of B1121 include: Open or short circuit in the sensor circuit; Damage to the sensor itself; Corrosion of contacts or connectors; Wiring Harness Problems.
How do I fix a B1121 diagnostic trouble code?
To fix B1121: Conduct diagnostics of the passive safety system. Check the integrity of wiring and contacts. Inspect the sensor for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1121?
Do not drive — repair immediately
How much does it cost to fix B1121?
The estimated repair cost for B1121 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat