Q: Q: my check engine light is on

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okay so I have a Toyota corolla 03 and the starter went bad and we usually get her to start by a light tap with a brass hammer on the starter but now it is too hung up and will not turn over and my check engine light never cut on until right before it stoped turning on with a tap of the brass hammer also my exhaust is sort of hanging side ways I was told it could be bad back flow sensor because before the car started and drove great even with a hung up starter

My car has 47000 miles.
My car has an automatic transmission.

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