OBD Guide
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B2704

Rear Sonar Sensor Left Outer

B2704 is an OBD-II diagnostic trouble code meaning: Rear Sonar Sensor Left Outer. Common causes: mechanical damage to the sensor, open or shorted wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • Incorrect operation of parking sensors
  • False alarms of the system
  • No sound signal when approaching an obstacle
  • Error message on the dashboard

Causes

  • Mechanical damage to the sensor
  • Open or shorted wiring harness
  • Contact corrosion
  • Malfunction of the parking sensor control unit
  • Sensor power problems

How to Fix

  1. Visually inspect the sensor for damage
  2. Checking the integrity of the wiring harness
  3. Cleaning contacts from corrosion
  4. Control unit diagnostics
  5. Replacing a faulty sensor

Related codes

B2705B2703B2706

FAQ

What does the B2704 code mean?

B2704 is an OBD-II diagnostic trouble code that indicates: Rear Sonar Sensor Left Outer

What causes a B2704 error code?

The most common causes of B2704 include: Mechanical damage to the sensor; Open or shorted wiring harness; Contact corrosion; Malfunction of the parking sensor control unit.

How do I fix a B2704 diagnostic trouble code?

To fix B2704: Visually inspect the sensor for damage. Checking the integrity of the wiring harness. Cleaning contacts from corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2704?

Limited driving only, diagnose soon

How much does it cost to fix B2704?

The estimated repair cost for B2704 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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