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Q: vsc, tract and check engines lights will not stay off on 2002 Toyota Sienna

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
at about 99000 my vsc light, tract and check engine light came on. Had sensors replaced, new catalytic converter. lights have come back on. van runs great, have put on additonal 3000 miles. mechanic has run scans, light goes out for awhile, but always comes back on. Wil vsc work in skid. It saved my neck up in Canada.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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i actually pulled up an old post, hoping you will be able to help me. I have a sienna as well as a sequoia with the same three lights dealership has the van and has run the diagnostic and they said that it was a speed sensor out...then they called back and said they narrowed it down under the dash and feel that it is the computer and it would cost $1200 and if we choose not to fix it then it is 200.00 for diagnostic....HELP!! I have two cars doing the same thing....and I am not confident that it is the issue because we go from one thing to another and then they "narrow" it down. Have you heard of this or anything like it?
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