Lexus Troubleshooting Questions? Ask a Lexus Expert
If the fuel cap was loose, this very well could be the problem. After tightening the fuel cap, and if this is in fact the problem, the vehicle needs to be driven roughly 50-75 miles of combined city and highway driving (aka "a Drive Cycle") before the on-board computer will recognize the cap is now sealing the system correctly. It's not an instantaneous thing immediately after tightening the cap. It's perfectly safe to drive the vehicle with these lights on, so put some miles and see if the light clears. If the light does not clear, then we'll need the Diagnostic Trouble Codes (aka "P-Codes") that are stored in the computer. These p-codes will more accurately point to the part or sensor that has the problem, and from there, the correct repair can be made. You can have these p-codes read FREE (except in California) at any local "big chain" part store (ie. AutoZone, PepBoys, Advanced, etc). If you found this answer helpful, please help me by leaving a rating using the "stars" at the top of the page or click 'accept'.Rating or accepting my answer does not cost you extra. It allows me to be credited for answering your question. Please do the right thing, and rate or accept.
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