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Lots of times a sensor is not reading properly or the evap system has a leak and it will not affect how the engine runs. You need to have the codes scanned, many parts stores will do it for free and you will know what area to address, most times the code will tell you exactly what needs to be replaced.

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Q: When the check engine light comes on a highlander is there something you can replace or check myself if it is running perfect?
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