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r u sure ba fords have 3 channel abs
by 3 channel i would thing thats 2 sensors on front and one on tailshaft output shaft

pretty sure they have a sensor on all 4 wheels
thought most cars since 2000 have a 4 channel setuop which is sensor on each wheel
my ford workshop manual says abs has 4 sensors and engine gets speed signal from abs ecu
if car doesnt have abs speed signal to ecu is from left hand rear abs ring or reluctor