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Originally Posted by JFP in PA
Unfortunately, I’d be willing to bet that a new cap is not going to cure this problem. P0453 is the code for an excessively high tank pressure; usually bad caps cause the opposite problem. More likely, you have either a bad pressure sensor or vent valve in your EVAP system……….
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grab a set of schematics and a DMM and check the voltage coming back from the sensor.
it should be about 2.5v -- if it deviates significantly == than you have
a sensor telling you something is up. you can't tell if the sensor
is bad or not.
if you changed the harness from original - there could be a pin out issue.
m