Ford Transponder Key 4D-63-80 Bit 5918997

The Ford Transponder Key 4D-63-80 Bit (Part No. 5918997) is a standard OEM-style immobilizer key used in many Ford, Lincoln, and Mercury vehicles.

 What it is

• Type: Mechanical key + built-in transponder chip
• Chip type: Texas Instruments 4D-63 (80-bit)
• Part number: 5918997 (Strattec OEM reference)
• Function: Works with Ford PATS immobilizer system (engine anti-theft)
  

  40-bit vs 80-bit

  • This is 80-bit security (more modern / more secure)
  • Many vehicles originally using 40-bit keys can sometimes accept 80-bit replacements, but programming success can vary by vehicle