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My check engine light is on in my 2007 Nissan Altima 2.5L

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My check engine light is on in my 2007 Nissan Altima 2.5L. The code read P0840 and I need help fixing it

Vehicle: 2007 Nissan Altima 2.5L

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P0840 NISSAN - Transmission Fluid Pressure Sensor 'A'

Read more: https://www.autocodes.com/p0840_nissan.html

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