P0174 and P0175
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New User
Joined: Jan 2005
Posts: 2
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P0174 and P0175
My F150 is getting the following codes.
P0174 System Too Lean - Bank No. 2.
P0175 System Too Rich - Bank No. 2.
An i am at a loss as to how the same bank can be both Too Rich and Too Lean. Truck runs fine in cool weather but like absolute crap
when it is warm out.
Any suggestion as to what might be causing it to run BOTH lean and rich on the same side?
P0174 System Too Lean - Bank No. 2.
P0175 System Too Rich - Bank No. 2.
An i am at a loss as to how the same bank can be both Too Rich and Too Lean. Truck runs fine in cool weather but like absolute crap
when it is warm out.Any suggestion as to what might be causing it to run BOTH lean and rich on the same side?
Elder User
Joined: Nov 2001
Posts: 892
Likes: 1
From: Duluth, MN
Just a thought. Can you watch your PIDs? Check the ECT sensor for a very low negative reading. A faulty ECT sensor could set your fuel trims very rich(thus setting a rich code?) and the O2 sensor could have then gone bad from the extra fuel setting a lean code at a constant low value? I have no idea where to start either, but this could be a hint? try watching the O2 sensor PIDs and see how they respond under different conditions.....
Tuned
Joined: Dec 2006
Posts: 291
Likes: 4
From: houston,tx
chech the connections at the o-2 on that side, make sure they're clean and secure. Also it may be contaminated-any sign of oil consumption? do you have a scantool with datasteam capabilities? if so watch how fast it becomes active-compare it to bank one
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