code p0171 a f/a sensor thats bad, is that on firewall side of engine?

Question

I was told with obd diagnostics PO171 I have a bad fuel air sensor, so would that be on the firewall side of engine for my 03 highlander 3.0 AWD 6 cyl. or radiator side?

Answer 1

P0171 Fuel trim lean Bank 1

Bank 1 location is at the firewall side,

​You can use the firing order to help determine the Banks where cylinder 1 is located this is Bank 1 , the other side becomes Bank 2