OBD Guide

B3971

Folding Top Position Sensor

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Retractable roof failure to operate
  • Error message on the dashboard
  • Problems with automatic opening/closing of the roof

Causes

  • Position sensor malfunction
  • Broken or damaged wiring harness
  • Contact corrosion
  • Problems with the control unit

How to Fix

  1. Check the condition of the sensor and its connection
  2. Check the integrity of the wiring harness
  3. Replace sensor if necessary
  4. Update the control unit firmware

Related codes

Error B3971 by Vehicle Brand