The code I get on check engine for 1998 Lexus es300 is P0171
The check engine keeps coming on after 100 miles or so then turns off for
about the same amount of miles. The code is P0171. After I put some fuel
injector cleaner it goes off. I do not drive the car much. Could it be that
water builds up in tank. System too lean - bank 1 (cylinder number 1
denotes bank 1) I took it to Autozone, and the same code has come up in
the past few months.
the po171 takes two trip cycles to set , it is a lean condition , vacuum leaks,injector restriction , fuel filter, temp sensor the one for the comp. not the dash, mass air flow sensor, the heated o2 sensor for that bank, i doubt the injector cleaner would fix anything. okay because its only 1 bank we can rule out fuel filter,mass air,temp sensor. i would look for vacuum leak , o2 ,injector things just related to bank one. if i had to guess with out running proper test i would go after bank 1 sensor 1 o2
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