Lookin' at my 04 Ford 150's 5.4L Triton. What is this engine component? I'm sure it has to do with the 4wd?
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That is the anti lock brake module or ABS. While it is in you engine compartment it has nothing to do with the engine. The reason it has a 4x4 sticker on it is that ABS for 4x4 vehicles is slightly different than the ABS on regular two wheel drive vehicles.