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What is the common cause of P0440 code showing up on the check engine light?

(2001 Lexus RX300)
in Muskegon, MI on April 30, 2012
I have been disconnecting the battery cable to turn off the check engine light but within one or two gas fillups it comes back on!
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Popular Answer
of Greg's Orange Auto on April 30, 2012
disconnecting battery will not clear code, you need a scanner. the po440 is and evap control issue. you ned to seek a diag from a good mech these can be tricky
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