Q: How do you reset computer for check engine light

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ECM was replaced

My car has 135000 miles.
My car has an automatic transmission.

In order to get the reset the ECM and get the check engine light to turn off I would recommend having a check engine light inspection having a mechanic like one from YourMechanic come to you and scan the computer to retrieve the stored codes and diagnose the cause of the codes. If no problems are found then the light can be turned off and codes cleared.

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