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i forgot the codes at home but i seem to remember they were all basically vacuum related (ie gas cap, egr). it just so happen i needed the 4wd the other day and it did not engauge. thought there may be related. as far as hi or low, i tried both settings and neither worked. the dash light did...

I have a 2001 Explorer Sport with an illuminated check engine light. Today I went to engauge my 4WD option, the 4WD did not kick in. My question is: are the two problems related? I had one person tell me that the 4WD was vacuum activated and someone told me it was not. Help Please. If they...