motoxron

So for the last few months i have had the p0175 bank 2 Rich code. Ive searched and searched fforums and have had it hooked up to machines a few times and noone could find out what was wrong. I noticed on the forums noone would post back and update what the fix was. Soo after replacing alot of stuff i replaced all the bank 2 fuel injectors and it looks like that was the problem. One of them looked burnt on the bottom. Just wanted to throw this out there for anyone who has this crazy code. Btw 02 F150 6cyl

motoxron

Looks like i spoke to soon. Engine lights back on. So new MAF, new injectors, new intake manifold gaskets upper and lower, new plenum gaskets, throttle body o'ring,IAC o'ring, new o2 sensors, new plugs. Now what????

dmbfan128

Did you try the plenum isolator bolts?

motoxron

Yes those were replaced as well. New air filter too. Im seeing people in other forums say maybe the fuel pressure regulator but with things like that it seems it would b rich on both banks not just one???

jt351

Not exactly, the regulator has a vacuum hose that goes to the intake, and it my be on that side so fuel can be leaking through the vacuum hose leaking fuel into that side. pull the hose off and wait an hour and see if any fuel comes out.

motoxron

I dont even see a FPR on this motor. The haynes book doesnt show one but it tels how to replace it. Any ideas?? 02 f150 4.2 6,cyl

motoxron

Ok so i found the FPR and its on the bank 1 side so i guess i can rule that out

Any ideas on what to check nxt?

jt351

Are you sure that the vacuum hose goes there, you realize that is a split port intake so the port might lead to that bank. Also you never mentioned anything about changing either upstream O2 sensors, they could be the culprit, but I would still check the vacuum line off of the regulator.

motoxron

Ahhh good point. I changed all 4 o2 sensors already. I pulled the vac line for the fpr off the plenum and no gas came out of the line. I let it sit for an hr. I'll pull the vac line off the fpr itself and see if gas comes out. This is so frustrating lol i have 2 months to figure it out before i get a smog check for tags. The light comes on so fast 8-10 miles so i wont pass smog

motoxron

No gas leaking out of the fpr im soooo stumped