system too lean, bank 1 and 2?

qwerty · #1 01-27-2010, 01:57 PM

hey guys.. i recently just gutted and my two larger rear cats on my 02 5.4L f150.. with no muffler and my pipe is cut off right after my passenger side o2 sensor.. i got my SES light on and got two codes.. system two lean on bank 1 and 2. my question is.. which o2 sensors are bank 1 and 2??? i did the GottsO2 mod on my two rear sensors.. did i need to do it on all four???

any help would be greatly appreciated guys.. oh and will this affect my trucks performance at all??

88racing · #2 01-27-2010, 02:14 PM

You may have a coincidental vacuum leak.

Grafix Ink. · #3 01-27-2010, 02:27 PM

front uppers.

i just ha the exact same codes on my crown vic - and with the cel light on my performance and mileage was heavily effected. once replaced the o2's everything was fine.

f150fella08 · #4 01-27-2010, 06:52 PM

you just need the Gotts mod on the back 2 sensors

b-ryan · #5 01-27-2010, 10:57 PM

i have the same exact problem no shop in town can figure it out im about to do the gotts o2 mod.

and yes it does effect proformance and MPG i cant haul anything without bogging it down and im getting about 7-10 MPG i have had it since early december

if you do fix it post it up so i can to

(might be a back pressure problem fixed buy a programmer and custom tune) just a theory though

qwerty · #6 01-27-2010, 11:11 PM

turns out that i just had a massive massive leak where my headers come into my exhaust piping.. no CEL thus far.. looks like i am good to go.. hopefully

b-ryan · #7 01-28-2010, 04:37 PM

did you take it to a shop or what???

qwerty · #8 01-28-2010, 07:22 PM

no didnt take it to a shop.. my CEL came back on but this time only bank 1 apparently.. will check for vacuum leak tomorrow i guess

b-ryan · #9 01-30-2010, 08:12 PM

alright. i finally giving up it i get 9 mpg or less this next half tank im taking it to the stealer-ship

DarrenWS6 · #10 01-30-2010, 10:05 PM

Quote:

Originally Posted by b-ryan

alright. i finally giving up it i get 9 mpg or less this next half tank im taking it to the stealer-ship

Do you like your truck? Reason asking was the last time I read that a guy had a problem with a 2002 truck and when he came back to report how he fixed it he said he fixed it by trading it in on a 2009

b-ryan · #11 01-31-2010, 09:21 AM

Quote:

Originally Posted by DarrenWS6

Do you like your truck? Reason asking was the last time I read that a guy had a problem with a 2002 truck and when he came back to report how he fixed it he said he fixed it by trading it in on a 2009

no i hate my ford. i know you will all hate me but i much rather have a chevy then ford. i grew up with chevys ( found this ford for 4500 01 4x4 5.4 ext cab 165000 miles). and im 17 i dont have the money now to get a new truck until i get my enlistment bonus

428gt · #12 01-31-2010, 10:38 AM

So you cut the exhaust off right after the rear O2's? It could be possible the exhaust is too short causing atmospheric air to enter the exhaust giving a false lean condition. Try adding a piece of exhaust piping to extend it 18" or so.

DarrenWS6 · #13 01-31-2010, 02:38 PM

Quote:

Originally Posted by b-ryan

no i hate my ford. i know you will all hate me but i much rather have a chevy then ford. i grew up with chevys ( found this ford for 4500 01 4x4 5.4 ext cab 165000 miles). and im 17 i dont have the money now to get a new truck until i get my enlistment bonus

No hating, We understand. Once you get that money maybe you can upgrade to somethingwith less miles. Buying a vehicle with such high miles always is a risk of problematic issues shortly after, but respect for you buying your truck and maintaining it.