Hi all,

I was hoping someone could help with my issue. I have a 2001 f150 5.4L with the service engine light on. Everything runs smooth and normal.

The error code for the service engine light is:

too lean bank #1
too lean bank #2

After turning off the truck and returning 5min later, it smells like fuel in the cab.

Fuel filter was just changed 7000 miles ago.
Im thinking maybe the oxygen sensors need to be changed. What else could be the problem with a 5.4L 2001 4x4 with 77000 miles? Has anyone seen an issue like this before?

Thanks for all the help and happy holidays everyone.

 

Dirty injectors?

 

Clean your MAF

If you got bank codes - then your O2's are working fine- that's what they do.

Not much to go on any way , you need to prduce the numbers from the OBD 2 Scanner in order to evaluate properly.

 

is the maf the Mass air Sensor? where is it located?

 

Inside the intake , heres a pic, it's behind the silencer(that webbed outer piece) spray some brake cleaner on it or Carb cleaner. Something that evaps fast. 30lbs of compressed air helps clean it the best. heres a pic -



Actually it's not visible in the pic, but it's in that bar thing that crosses the center and it has two little wires that are horizontel , you'll see what I mean when you look at yours yourself. Clean those reboot your PCM and you'll see a world of difference in performance if you haven't done this before.

You also access it opposite side of the openning in the pic - pull it off the truck and access thru filter side, shine a flashlite inside to reveal the MAF sensor.

Not sure how else to explain , others may chime in to do so if I overcomplicated it lol..

Good Luck!!

 

C'mon guys. you should know by know that this code combo is almost always the same - a vacuum leak. It's also almost always the exact same place - the PCV hose elbow.

It is NOT the O2 sensors.

It could be a MAF sensor, but 20 to 1 odds say "vacuum leak".

Steve

 

Another issue with lean codes is that the DPFE sensor itself goes bad , that's another common issue with lean codes..here's a pic of that -



#4 is your DPFE Sensor

 

If that doesn't rid you of lean codes then a less common failure is the drivers side forward O2 sensor , which I doubt is the prob , but that's what I'de hit next.

Hope this solves your issues.

 

Crap!! Steves right , sorry boss - forgot that one !!!

 

You have to reach behind the TB to locate, yep , very likley that's the prob.

I'll see if I got a pic of that .

 

Well that's the TB - the vac line in reference is not pictured - it's further behind the thottle body , you have to reach behind to locate.
Isn't that right Steve? never had one break on me before , but I know it happends allot!!

 

Awesome!!! Once the sun comes back up I will have to check it out, as long as the apartment staff doesnt yell at me.

 

you have to deal with that too lol...

 

Maannn, that would suck - to bad you'all wern't a little closer lol

 

Thanks project for the reply. I was cleaning some of the hoses off to see if i could see a crack and to my suprise, the pcv wasnt even connected.

My next problem is, How do i get the service engine light off? I heard someone say drive 5 miles and it will reset. I just got done driving 10.9. I could disconnect the battery, or is there a better way? If I disconnect the battery, how long do I have to wait for the capacitors in the circuitry to lose its memory and wipe out the code?

Thanks all who replied with help.

Take care.