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What is the common cause of P0440 code showing up on the check engine light? on 2001 Lexus RX300

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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!
(1) Answer
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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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