OBD Guide
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B1120

Left Air Bag Satellite Sensor

B1120 is an OBD-II diagnostic trouble code meaning: Left Air Bag Satellite Sensor. Common causes: damage to the left side airbag sensor, open or short circuit in wiring harness. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Airbag light is on
  • Restraint system does not activate in left side impact
  • Error B1120 in fault memory

Causes

  • Damage to the left side airbag sensor
  • Open or short circuit in wiring harness
  • Sensor contact corrosion
  • Airbag control module malfunction

How to Fix

  1. Conduct diagnostics of the passive safety system
  2. Check the integrity of the wiring harness to the left sensor
  3. Check the condition of the sensor contacts
  4. Replace the faulty sensor if necessary
  5. Reset the error and check the system operation

Related codes

B1121B1122B1000

FAQ

What does the B1120 code mean?

B1120 is an OBD-II diagnostic trouble code that indicates: Left Air Bag Satellite Sensor

What causes a B1120 error code?

The most common causes of B1120 include: Damage to the left side airbag sensor; Open or short circuit in wiring harness; Sensor contact corrosion; Airbag control module malfunction.

How do I fix a B1120 diagnostic trouble code?

To fix B1120: Conduct diagnostics of the passive safety system. Check the integrity of the wiring harness to the left sensor. Check the condition of the sensor contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1120?

Do not drive — repair immediately

How much does it cost to fix B1120?

The estimated repair cost for B1120 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat