I have ford xpedition 2000 whit p1892 cod...

    Dont really understand the question but from what I can see the GEM is involved. On this model it usually has to do with a windshield water leak allowing water to intrude into the GEM. Push up on the upper left hand side of the windshield and se if it moves. If it does the glass must be replaced to properly repair the leak. Then and only then do you replace the GEM and possibly the fuse box due to water damage.