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Q:

why are trac off and cel lights both on on 1992 Lexus LS400

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i had both rear os replaced, do i need to replace front os too
(1) Answer
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I will be happy to read the fault memory for you. Anything that effects emissions will put the MIL on even a transmission problem. If the tracs lamp is on it may be the reason the MIL is on.