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

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
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