check engine light on 2001 Toyota Highlander

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.

Asked by for the 2001 Toyota Highlander
2 answers 1 comment
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.