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Can someone help me with a PO840 scanner problem with a 2007 Nissan altima?

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Pressure sensor switch A & B

Vehicle: 2007 Nissan Altima

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You could start by checking the transmission fluid level and condition. Add fluid if necessary, but if the fluid is very dark you should have a transmission tech specialist check the transmission for you. 

P0840 Nissan - Transmission Fluid Pressure Sensor A

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

 

 

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