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broken evap line/port on fuel pump. Or leaking fuel pump o-ring
check the EVAP canister it is right next to fuel filter could be pcm needs update to fix false codes. Here is a old hillbilly trick that may help put saliva on the seal of gas cap when you fill up every time that may work for you.
As long as there is a problem with the valve the light will stay on. I would take it to another mechanic for two reasons. 1 second opinion, 2 the mechanic should have told you the code and explained what the problem was, not just give you a price. And I think $200.00 is alittle steep
Did you erase the code after you repaired the problem ??..Emission leaks are usually not affective
to the engine performance...But a gas cap is for some reason...You actually need an emission
leak tester hooked to it ...Or a DRB III eng. analysis tool....I am chrysler tech.....
But normally emission troubles wont make it run rough unless it is very bad !
It may be your O2 sensor.Doublecheck gas cap security.....make sure old code is cleared before you make any more adjustments....Check engine for any vacum leaks...This could be the problem....Because it shouldnt run good for a day after changing only the gas cap...
Make sure all electrical connections ( PLUGS/WIRES/INJ.CONNECTIONS...etc..) are good...
You may have to take to dealer to clear codes and recheck.....Maybe update PCM
Hope this helps.......................................Level II CHRYSLER ..................Metalpoet
Did you change the gas cap with a Honda gas cap? Tighten it at least three clicks?
Also, Honda recommends that you never top off the tank when getting gas (only go to the click-off of the pump; otherwise you can get back flow into the system that will cause the code).
Tightening or replacing the cap will not immediately cause the light to go off; it can take up to three days of driving for the light to reset.
To check if your readiness codes (emission system) are set, turn the ignition to ON (II), without starting the engine. The Malfunction Indicator Lamp will come on for 20 seconds. If it then goes off, the readiness codes are set. If it blinks 5 times, the readiness codes are not set.
You can, of course, try resetting your engine light to see if it will come back on (which it probably will). I believe the procedure is: Turn off the engine. Press and hold the Select/Reset knob (odometer) in the instrument panel, then turn the ignition switch to ON (II). Hold the knob for approximately ten seconds until the indicator resets.
If you have an Advance Auto Parts store where ever you are, they will read the code and tell you exactly what to code is and what it means. Any mechanic who "guesses" isn't a mechanic at all - he's a thief. Emissions leak can be any number of things, but not the gas cap!