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Q: check engine light and trac control OFF and then it runs real rough on 1999 Lexus RX300

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This has occured many times in the last few weeks, i have been told that it is some type of control valve that needs replacement.
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check engine light is a fuel control issue. you need the code pulled and share that with us so we can give you ideas on the failure.

Is the abs light on too? usually on when trac light is on. that will store a code as well and we need that to help you along with the repair.

the code pull from check engine light can be free from autozone or pepboys.
the code from the trac is a full diag with a scan tool and will cost about an hour of labor in a shop.

Roy
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