Ford Focus Owners Manual: Principle of operation
Ford Focus Owners Manual / Engine immobiliser / Principle of operation
The engine immobiliser is a theft protection system that prevents someone from starting the engine with an incorrectly coded key.
Coded keys
Note: Do not shield your keys with metal
objects. This may prevent the receiver
from recognising your key as a valid one.
Note: Have all of your remaining keys
erased and recoded if you lose a key ...
More about Ford Focus:
Ford Focus Valve Inspection
Inspect the following valve areas:
The end of the stem for grooves or scoring.
The valve face and the edge for pits, grooves or scores.
The valve head for signs of burning, erosion, warpage and cracking.
The valve margin for wear.
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