OBD Guide
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B1086

Front Pre-Tensioner Left Open

B1086 is an OBD-II diagnostic trouble code meaning: Front Pre-Tensioner Left Open. Common causes: broken wires in the passive safety system harness, pretensioner squib malfunction. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Airbag light is on
  • The passive safety system may not work in an emergency situation

Causes

  • Broken wires in the passive safety system harness
  • Pretensioner squib malfunction
  • Corrosion or oxidation of contacts
  • Damage to the SRS control unit

How to Fix

  1. Check the integrity of the wiring harness to the left front pretensioner
  2. Inspect contacts for corrosion
  3. Check the resistance of the pretensioner squib
  4. If necessary, replace the pretensioner or wiring harness.
  5. Reset the error and check the system

Related codes

B1085B1087B1088

FAQ

What does the B1086 code mean?

B1086 is an OBD-II diagnostic trouble code that indicates: Front Pre-Tensioner Left Open

What causes a B1086 error code?

The most common causes of B1086 include: Broken wires in the passive safety system harness; Pretensioner squib malfunction; Corrosion or oxidation of contacts; Damage to the SRS control unit.

How do I fix a B1086 diagnostic trouble code?

To fix B1086: Check the integrity of the wiring harness to the left front pretensioner. Inspect contacts for corrosion. Check the resistance of the pretensioner squib. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1086?

Limited driving only, diagnose soon

How much does it cost to fix B1086?

The estimated repair cost for B1086 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat