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Check engine or sometimes called MIL (malfunction indicator light) is mainly related to emissions. The TOP reasons are oxygen sensors and smog related items. Unplug your negative battery post for a minute or two and see how long it takes for the light to come on again. On mine it was a sensor and came on within about 3-5 miles of city driving.

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Q: What are the top reasons a check engine light will come on in a 1998 Lexus gs400?
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