The engine immobiliser is a theft protection system that prevents someone from starting the engine with an incorrectly coded key.
Coded keysFord Focus Ignition Coil-On-Plug
Material
Item
Specification
Motorcraft® Silicone Brake Caliper Grease and Dielectric Compound
XG-3-A
ESE-M1C171-A
Removal and Installation
Disconnect the ignition coil-on-plug electrical connector.
NOTE: When removing the ignition coil-on-plugs, ...