i work at a transmission shop i see these all the time it is an oxygen sensor. they can be expensive so be prepared
Perhaps a clogged fuel filter.
That code is telling you that bank two is running too lean. For some reason the fuel mixture is too lean. Possibly an o2 sensor is malfunctioning.
Bank 2 running too lean.
what does system to Lean Bank 1 on 740iL 2001 means
P0171 System too Lean (Bank 1)
P0171-system too lean bank 1 and P0174-system too lean bank 2
Bank 1 is the passenger side of the engine , engine cylinders # 1 , 2 , and 3 Bank 2 is the drivers side of the engine , engine cylinders # 4 , 5 , and 6 firewall 3 - 6 2 - 5 1 - 4 front of Ford Explorer ( V6 ) The fuel mixture for the engine is running lean ( there is not enough gas in the air / fuel mixture )
Check your Plugs and coils
If one bank is running lean it usually means that you have a vacuum leak somewhere on that side. Check for broken hoses that connect to that side or possibly broken gaskets. changed all hoses what gasket
1999 Ford Taurus. System Adaptive fuel too lean banks 1 and 2. How can I fix these.
system to lean bank one 02 sensor ?
"http://wiki.answers.com/Q/Lean_bank_sencers_ford_explorer_where_are_they_located_on_a_2000_ford_explorer_4.0_v6"