OBD Guide
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B1078

Diagnosis Sensor Unit

B1078 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: broken or damaged wiring harness, contact corrosion. 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 activate
  • Error B1078 persists after scanning

Causes

  • Broken or damaged wiring harness
  • Contact corrosion
  • Malfunction of the sensor diagnostic unit
  • Unit power problems

How to Fix

  1. Check the wiring harness for breaks and damage
  2. Clean contacts and check their condition
  3. Test the sensor diagnostic unit
  4. If necessary, replace the diagnostic unit

Related codes

B1077B1079B1080

FAQ

What does the B1078 code mean?

B1078 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit

What causes a B1078 error code?

The most common causes of B1078 include: Broken or damaged wiring harness; Contact corrosion; Malfunction of the sensor diagnostic unit; Unit power problems.

How do I fix a B1078 diagnostic trouble code?

To fix B1078: Check the wiring harness for breaks and damage. Clean contacts and check their condition. Test the sensor diagnostic unit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1078?

Do not drive — repair immediately

How much does it cost to fix B1078?

The estimated repair cost for B1078 is $111–333. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat