OBD Guide
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B1B40

Left Front Outer Parking Aid Sensor

B1B40 is an OBD-II diagnostic trouble code meaning: Left Front Outer Parking Aid Sensor. Common causes: mechanical damage to the sensor, open or shorted wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • Inoperative parking sensor
  • False alarms of the parking system
  • No sound signal when approaching an obstacle

Causes

  • Mechanical damage to the sensor
  • Open or shorted wiring harness
  • Contact corrosion
  • Internal sensor fault

How to Fix

  1. Check the integrity of the sensor and its fastening
  2. Check wiring harness for damage
  3. Check contacts for corrosion
  4. Replace sensor if necessary

Related codes

B1B41B1B42B1B43

FAQ

What does the B1B40 code mean?

B1B40 is an OBD-II diagnostic trouble code that indicates: Left Front Outer Parking Aid Sensor

What causes a B1B40 error code?

The most common causes of B1B40 include: Mechanical damage to the sensor; Open or shorted wiring harness; Contact corrosion; Internal sensor fault.

How do I fix a B1B40 diagnostic trouble code?

To fix B1B40: Check the integrity of the sensor and its fastening. Check wiring harness for damage. Check contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1B40?

Limited driving only, diagnose soon

How much does it cost to fix B1B40?

The estimated repair cost for B1B40 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat