OBD Guide
ENFRDEESPT

B2191

Difference Of Key

B2191 is an OBD-II diagnostic trouble code meaning: Difference Of Key. Common causes: faulty or incorrect ignition key, damage to the chip in the key. Estimated repair cost: $56–167.

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

Symptoms

  • Engine won't start
  • The immobilizer indicator is flashing
  • Car stalls after starting

Causes

  • Faulty or incorrect ignition key
  • Damage to the chip in the key
  • Immobilizer malfunction
  • Problems with the wiring harness or contacts in the ignition switch
  • ECU software failure

How to Fix

  1. Check the ignition key for damage
  2. Try using a spare key
  3. Check the wiring harness and contacts in the ignition switch
  4. Diagnose the immobilizer using a scanner
  5. Reprogram the key or immobilizer if necessary

Related codes

B2190B2192P0513

FAQ

What does the B2191 code mean?

B2191 is an OBD-II diagnostic trouble code that indicates: Difference Of Key

What causes a B2191 error code?

The most common causes of B2191 include: Faulty or incorrect ignition key; Damage to the chip in the key; Immobilizer malfunction; Problems with the wiring harness or contacts in the ignition switch.

How do I fix a B2191 diagnostic trouble code?

To fix B2191: Check the ignition key for damage. Try using a spare key. Check the wiring harness and contacts in the ignition switch. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2191?

Yes, but get it checked soon

How much does it cost to fix B2191?

The estimated repair cost for B2191 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat