You need to determine exactly what lights are on before you can proceed. If you have the CEL on in addition to the 2 lights you mentioned proceed as bob2200 sugested above. If not I suspect you need to do a zero point calibration, which was a common problem with 2001. Read the attached link plus all the links within for more info on zero point calibration:
Or no matter what lights you have on, you may want to disconnect the negative battery cable for a few minutes and see if you get lucky.