Q: Q: Check Engine light on

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I brought my car for inspection and it failed due to the check engine light. It's showing a P0740 and P1456 codes. I went to my regular mechanic and said that I need to replace my transmission! About a month ago, I was there for an oil change and a transmission fluid replaced. My maintenance required went off but then the check engine light went on? I'm asking for a second opinion. Thanks!

My car has 218183 miles.
My car has an automatic transmission.

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