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most of these codes appear if the driver forgets to put the gas cap back on, or the gas cap seal is bad. double check the vacuum line from the throttle body to the purge solenoid for leaks. The best way is with a smoke machine. There could also be an issue with the purge solenoid or the electrical connection to it.

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Q: What does a p0440 evaporative emission evap system fault mean on a 2003 dodge neon srt-4?
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