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Trac Off and Engine light on 2001 Lexus ES300

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Had brakes replaced last night, today the trac off and engine light came on, what should I do?
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It may be a failed anti lock brake speed sensor (seeing as brakes were just replaced). Don't be overly concerned that check engine light and traction control light are on, as many sensors are shared by both power train, stability control and traction control. It is likely to be only one fault that then relates to all systems. A scan tool is needed to retrieve the codes stored in your car's computer.
Thank you!!!!! I went to autozone and I have 3 codes - po446, po171, po174 can you help?