[asphaltgambler]

Couple-O-things here on OBDII that will frustrate you.

Whether it is a Ford Taurus, BMW 540 or Porsche; OBDII is almost a complete waste of time and energy to try to properly diagnose any issue on a late model vehicle.

Yes the codes numbers are the same for which ever vehicle you are working on but that doesn't mean they will lead you to the problem.

All vechicle manufacturers were 'forced' into complying to OBDII standards from 1996 on. They said "Yeah............OK...............we'll comply.................wink-wink"

Each Manufacturer has their own scan tool with their own software, with their own procedure for diagnosing, repairing, clearing code(s) and verifying the repair. Do you think all that knowledge and information will be exactly paralell to OBDII? - No.

If you're very lucky your particular problem may be on the Official OBDII list with repair instructions.

Example: BMW complies with OBDII.............but it was not until late production 2000 model year they completely did so. All OBDII spec scan tools communicate at a rate of 10MBS - that is the standard.

The BMW Factory scan tool (GT1) communicates at the rate of 100MBS. If you connect a generic OBDII scan tool to a BMW the computer senses the slower (10MBS) connection and automatically switches to the OBDII software. Which, by no coincedence, is only about 10-15%
of the capability of the sytems self diagnostics.

Point is even your Ford is programed this way. The OBDII code may not even point you to the proper fault area or worse the symptom/fault may not be recognized by OBDII.

As far as your specific problem; the majority of EVAP codes have to do with the fuel cap failing or not seated properly after a fill up.

Best advice here. Go to that auto parts store that read-out the code(s) for you. Buy a quality fuel cap and install it. Have them erase the code. If they have a scanner to read OBDII the scanner will have the capability to erase.

Drive the vehicle. It may take 3-10 complete key/drive cycles to verify as to whether it's fixed or the problem remains. If it remains take it to a reputable shop that has a factory scan tool.................which unfortunately may only be a Ford dealer.