4.6L General DiscussionThis section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.
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I have trouble codes P0175 (rich bank 2), P0172 (rich bank 1), and P0153 (circuit condition O2 sensor bank 2). I went to autozone and they printed them out for me. On the Probable cause part for the P0172/175 codes it says if they are both going off then suspect a fuel pressure condition or MAF sensor fault. I know I don't have a fuel pressure condition but how would I know if my MAF is at fault without replacing it? I visually inspected the tube and it's brand new type of clean (it's only 3 years old). One thing to note, My K&N air filter was so filthy that it had sludge in the crevices (I'm cleaning it now). But I still don't think that could cause those 3 codes to go. I could have a bad O2 sensor but it wouldn't explain both banks being rich. One of my O2 sensors went bad last year and I replaced that one. Only the front O2 sensors are activated because I have no cats.
Any suggestions? if more info is needed let me know.
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99 gt vert, auto, 50 lbs. inj., 2800 stall, transgo stage III shift kit, 3.55 gear, Trick Flow Twisted Wedge Heads, Comp Cams blower cams, forged internals with 18.1 cc dished pistons (8:1 CR), 75 mm TB, CAI, MSD Ig. coils, coated long tube headers w/offroad pipes, eibach pro damper, SCT Livewire tuner, Saleen Series IV SC w/ 2.8" pulley, Chicane intercooler, LFP Heat Exchanger, and Nitto 555 drag radials. 398 rwhp / 342 rwtq.
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