odb11 codes

Ihave 2002 dodge truck w/4.7 liter engine ,the engine light is coming on ,i had it read buy a mechanic and it read p 1491 said it was probably solenoind
purge valve,it looks easy enough to replace ,but in order to clear engine light, what would be a good inexpensive scanning tool?
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Don't know about the scan tool but P1491= Radiator fan control relay circuit.
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Any OBD-II code reader will do it. Here's one for $40: http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber 168
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