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