2011 Toyota Avalon Questions

All 2011 Toyota Avalon Questions

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All happened at once when I went to honk the horn I have a code tester no codes errors
my car is in good condition and i dont rag it out i only drive from point a to point b.....why do you think the check engine light is coming on?....im getting your oppinion so i dont get ran over.....thanks
Will the OBD system alert when the PCV Valve needs replacement? THANKS!