Service Engine light came on. mechanic said I need a new Mass Airflow sensor. So I bought one and put it on. Then I drove it without clearing the Service Engine soon light. The transmission started downshifting hard and a warning light came on for the transmission. I think they call it limp mode. So I put the old Mass Airflow sensor back on and the problem went away with the transmission. So now I still need to change the airflow sensor. I guess put it back on and clear the code, and hope for the best ? I'm hoping that because I didn't clear the code is why the transmission problem came up.
Mass airflow
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