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Q: check engine light on 2001 Toyota Highlander

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
check engine light has been a constant problem for the past 3-4 yrs. 01" highlander, 77000 miles, has had o2 sensors changed and fuel mixture sensors changed over this time. Light has come on again(need to have this one read), is this a common problem for this year? Up to the first 5-6 yrs never a problem.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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i had the same issue and next thing is to check your catalytic converter. i will almost promise you that that is why the light is on. i had the same issue happen to my car.
that was the answer--dealer said whole assembly needs to be replaced-front and rear cats. Had this verified by a private shop but they said i might be able to replace just the one thats reading bad with after market equip-do you agree and what was the cost you were quoted-Thanks
Change your gas cap,make sure gas cap is snug each time you stop at a gas station to get gas.
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