I took my 99 dodge grand caravan to advanced auto and got a computer readout of p1491 as the error code. is this important and is this expensive?

Yes no problem.

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As a Dodge code it refers to..
P1491 Secondary Switch Solenoid Circuit Malfunction.
"P1491 is for the cooling fan relay circuit. There is a seperate fan for the a/c condensor on your truck. When this code sets it is because the fuse is blown. Its fuse 39 in the box under the hood. The cause of this fuse blowing is a bad fan motor."

fix error and go to advanced auto,auto zone ,pep boys and they will clear them for free.

code P1491 radiator fan control relay circuit.

Trouble code P1491 means: Radiator fan relay control circuit

Just replacing the relay will not reset the code. You need to reset the code in your computer. If you disconnect the battery for about 20 minutes it should reset.

Chrysler EVAP P0442 P0445 Smoke Diagnostics
P1698 Dodge PCM Fault No CCD Message From TCM
Do you know what a serial data communication network is ?
CCD SCI DATA LINES TECH TIP

Sorry dude but you don't have a prayer of a chance to fix this ! You know anything about automotive electronics , electrical systems ? Have a factory or professional scan tool . Going to advance auto won't cut it .

you have an open or shorted condition detected in the low speed radiator fan relay control circuit. hope this will help!!!!

radiator fan relay circuit.

the a/c condenser fan fuse could be blown. replace fuse and disconnect battery. there is also a TSB relating to this. call dealer to confirm