Q: My check engine light is on on 1998 Lexus LX470

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I have a lexus LX470 year 1998 with 70K miles 1 month ago I got the check engine ligh on for the first time ever I have taken it to the dealer 3 times because the first two times they said it was a fault with the velocimeter then that is was juts a resetting issue and know they say I have to change the ECU. Two times they reset it and after one week the check engine came on again. I dont trust them and think there is really something else.
(1) Answer

Click that link to find another technician and shop near you to give you a second opinion.

Whereas anything is possible, chances are your issues are complex and hard to duplicate during testing. Things like that can make looking competent difficult for a technician.

A second opinion will really help clear things up.