Trouble shoot codes p0113, p0171, p0174, and p0304

Asked by Mar 19, 2015 at 08:04 PM about the 2001 Ford F-150 XL LB

Question type: Maintenance & Repair

I need to know where is the IAT  
sensor located on my vehicle. Also I
just replaces the fuel pump and filter
and also the power steering pump. But
codes coming up say System to Lean
Bank 1 and one for Bank 2 Also says
misfire on cylinder 4 so I went ahead
and purchased new spark plugs for it
cuz I'm sure they need to be replaced
already again. The p0171 code has
been going on for a little while since
about last July to be honest but the
other codes are all new and I don't
know what any of them mean.. I am a
female and am just learning how to
deal with the vehicle maintenence
myself now.  Please be patient with

1 Answer


Those codes normally indicate a problem with an oxygen sensor. Also, do not unhook the battery to erase the codes, go to a place like autozone and have the codes erased with a scanner. The PCM has to relearn everything and the codes are not erased from memory when the battery is disconnected.

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