How much does a smoke for evap cost? on 2001 Dodge Caravan

p0455 code....have tightened the gas cap and replaced 3 weeks ago prior to the p0455.

Asked by for the 2001 Dodge Caravan
Evaporative codes can be a hassle to track down, make sure someone trouble shooting the problem is familiar with Caravans. We get an hour to an hour and half to smoke test the system power solenoids and check for leaks.