OBD Guide
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B1126

Diagnosis Sensor Unit

B1126 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: damage to the sensor diagnostic unit, open or shorted wiring harness. Estimated repair cost: $111–333.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$111–333 (est.)

Symptoms

  • Airbag light is on
  • The passive safety system does not respond to tests
  • Error persists after reset

Causes

  • Damage to the sensor diagnostic unit
  • Open or shorted wiring harness
  • Contact corrosion
  • Software error

How to Fix

  1. Check the wiring harness for damage
  2. Check the contacts of the sensor diagnostic unit
  3. Test the diagnostic unit using a scanner
  4. Replace the diagnostic unit if necessary

Related codes

B1125B1127B0100

FAQ

What does the B1126 code mean?

B1126 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit

What causes a B1126 error code?

The most common causes of B1126 include: Damage to the sensor diagnostic unit; Open or shorted wiring harness; Contact corrosion; Software error.

How do I fix a B1126 diagnostic trouble code?

To fix B1126: Check the wiring harness for damage. Check the contacts of the sensor diagnostic unit. Test the diagnostic unit using a scanner. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1126?

Do not drive — repair immediately

How much does it cost to fix B1126?

The estimated repair cost for B1126 is $111–333. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat