OBD Guide
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B1B78

Passenger Seat Weight Sensor 3 Left Front Performance

B1B78 is an OBD-II diagnostic trouble code meaning: Passenger Seat Weight Sensor 3 Left Front Performance. Common causes: load sensor malfunction, wiring harness damage. Estimated repair cost: $56–167.

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

Symptoms

  • The security system malfunction indicator is on
  • Incorrect operation of airbags
  • Error message on the dashboard

Causes

  • Load sensor malfunction
  • Wiring harness damage
  • Problems with sensor contacts
  • Security module malfunction

How to Fix

  1. Check the integrity of the wiring harness
  2. Check sensor contacts
  3. Replace the load sensor if necessary
  4. Reset the error and check the system operation

Related codes

B1B77B1B79B1B80

FAQ

What does the B1B78 code mean?

B1B78 is an OBD-II diagnostic trouble code that indicates: Passenger Seat Weight Sensor 3 Left Front Performance

What causes a B1B78 error code?

The most common causes of B1B78 include: Load sensor malfunction; Wiring harness damage; Problems with sensor contacts; Security module malfunction.

How do I fix a B1B78 diagnostic trouble code?

To fix B1B78: Check the integrity of the wiring harness. Check sensor contacts. Replace the load sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1B78?

Do not drive — repair immediately

How much does it cost to fix B1B78?

The estimated repair cost for B1B78 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat