OBD Guide
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B1143

Diagnosis Sensor Unit

B1143 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: malfunction of the sensor diagnostic unit, wiring harness damage. 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 when diagnosing the security system

Causes

  • Malfunction of the sensor diagnostic unit
  • Wiring harness damage
  • Short circuit in the circuit
  • Unit power problems

How to Fix

  1. Check wiring harness for damage
  2. Check the power supply to the diagnostic unit
  3. Replace the sensor diagnostic unit if necessary
  4. Reset the error and test the system

Related codes

B1140B1141B1142

FAQ

What does the B1143 code mean?

B1143 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit

What causes a B1143 error code?

The most common causes of B1143 include: Malfunction of the sensor diagnostic unit; Wiring harness damage; Short circuit in the circuit; Unit power problems.

How do I fix a B1143 diagnostic trouble code?

To fix B1143: Check wiring harness for damage. Check the power supply to the diagnostic unit. Replace the sensor diagnostic unit if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1143?

Do not drive — repair immediately

How much does it cost to fix B1143?

The estimated repair cost for B1143 is $111–333. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat