Yes if you disconnect the battery then the stradegies reset and it does take awhile for them to reset.
However if the service engine soon light is coming on then there is a problem with your vehicle.You will need to have it scanned for codes. Since you are blowing black smoke at start up I suspect either a vacuum line is off or a loose connection at the Mass Air Flow sensor.
He has broken the pipe going to the egr valve and it is letting the smoke out of the car, take it back tell him to fix it as it didn't even make it out of his yard and he can drive it till it's fixed and he can give you a loner till he gets it rest or fixed or you will see him in court.
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