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Peter Bagley
Peter Bagley, Toyota mastertech
Category: Lexus
Satisfied Customers: 774
Experience:  master tech at Toyota dealer
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My fuel cap was loose on my '12 GX 460 and I had not drove

Customer Question

My fuel cap was loose on my '12 GX 460 and I had not drove it for 7 days. The 4LO is flashng and TRAC OFF is on and the check engine light too.
JA: Does the light stay on, or does it blink?
Customer: which one?
JA: Are you fixing your GX 460 yourself? What have you tried so far?
Customer: Yes - reset the Trac button in neutral and tightened the fuel cap.
JA: Anything else you want the mechanic to know before I connect you?
Customer: strong smell of gas in the cab
Submitted: 10 months ago.
Category: Lexus
Expert:  Peter Bagley replied 10 months ago.

Hello and welcome to just answer.I value your input to my questions so I may help you better.Your vehicle does an automatic self check on the EVAP system and if you lefy the filler cap loose or off it would detect a gross leak and set codes for that, in doing so it will disable trac abs so to correctly solve that you need to tighten cap and cancel any codes then it will return to normal. Then it will need time for the system to go through a leaning period to reset all internal reediness readings. Hope this helps you understand how the system works .If you need further help let me know.