P1151 Code need help
Thread Starter
|
New User
Joined: Feb 2004
Posts: 14
Likes: 1
From: Westminster Md.
P1151 Code need help
I have 1999 F250 v10 5 speed manual transmission and my service engine soon light popped on . So I drove to auto zone and they ran a check of the codes . It indicated just one code P1151 which they said was mass air sensor so i bought one installed it and also bought a code scanner . So I drove it for about an hour light pops back on giving me the code P1151 again . I erased the code and this morning after 20 minutes of driving it pops on again. This is getting frustrating . Anyone have any ideas why ? I am almost certain the new sensor is working because truck seems to run ok . Plenty of power and does not appear to be eating fuel . Could simply replacing the air cleaner fix this problem it is due for an air cleaner . I am just not sure where to look now . Any suggestions ?
Posting Guru
Joined: Apr 2003
Posts: 1,089
Likes: 1
From: Michigan
First of all go back to Auto Zone and smack the guy in the face who told you P1151 was a MAF sensor code. P1151 is lack of HO2S-21 switches - sensor indicates lean. This is the bank 2 (drivers side) Oxygen sensor, where the sensor is not switching from rich to lean like it should. Now before you go out and buy a new O2 sensor, make sure there arn't other things that could be causing this to occure. A lean condition in bank2 can be caused by things like a vacuum leak from the intake manifold or some other unmetered air leak. Make sure you check this out first. However, if your truck has over 100k on it, it is probably just the O2 sensor. They really arn't designed to last much longer.
Last edited by rlh68050; Jun 27, 2005 at 09:36 AM.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Check the PCV valve elbow where it connects to the throttle body. Lots of people have gotten lean (or other) codes from that vacuum leak.
Check everything else for vacuum leaks too...
The MAF usually doesn't go bad, just needs to be cleaned. I've seen cars that do not produce codes where the MAF was so black with gunk it was amazing. After cleaning, they ran much better...
Anyway... check the wiring to that O2 sensor also! But if all else fails, replace that darn thing.
Check everything else for vacuum leaks too...
The MAF usually doesn't go bad, just needs to be cleaned. I've seen cars that do not produce codes where the MAF was so black with gunk it was amazing. After cleaning, they ran much better...
Anyway... check the wiring to that O2 sensor also! But if all else fails, replace that darn thing.
Thread Starter
|
New User
Joined: Feb 2004
Posts: 14
Likes: 1
From: Westminster Md.
Thank you i will look for vacuum leaks first and if I do not find any I will bite the bullet and replace the O2 sensors . It is my understanding they should be Replaced in Pairs . Hopefully will not be too hard to replace them . I bought my own code scanner for this reason and i just installed software on computer and looked up code and you are right . One would think if they are going to scan codes for free they should give the correct answer.
Posting Guru
Joined: Apr 2003
Posts: 1,089
Likes: 1
From: Michigan
Originally Posted by Mike's250
One would think if they are going to scan codes for free they should give the correct answer.
Thread Starter
|
New User
Joined: Feb 2004
Posts: 14
Likes: 1
From: Westminster Md.
If i should need to replace these o2 sensors are they very difficult to remove afterall they do have 106000 miles on them . I know I will need the o2 sensor socket but will just wrenching them out work or do I need to use a torch to heat them up first or Rust buster ? I never had to replace these on any vehicle I have owned .
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
I've never done it either, believe it or not, but shouldn't be too hard, the exhaust is stainless steel (mild, but still, stainless steel)...
I would certainly put some penetrating oil on it (NOT wd40!), and try to get as much of it off as possible after getting out the O2 sensor - it'll smell real nice if you don't.
I would certainly put some penetrating oil on it (NOT wd40!), and try to get as much of it off as possible after getting out the O2 sensor - it'll smell real nice if you don't.
Trending Topics
Thread Starter
|
New User
Joined: Feb 2004
Posts: 14
Likes: 1
From: Westminster Md.
Thanks guys I will investigate this tonite when I get home from work and will repost when i get problem fixed . I looked at wires at lunchtime and they appear to be in good shape . Will listen and look for vacuum leaks again but still came up empty handed . If i cant find any I will just install the 02 sensor on drivers side and see what comes out of it .
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
Thread Starter
|
New User
Joined: Feb 2004
Posts: 14
Likes: 1
From: Westminster Md.
Ok guys got It fixed . I searched for vacuum leaks and found none . So I replaced the O2 sensor on the drivers side and erased the codes . I have driven around 100 miles and everything seems fine now . For those of you who have never done an O2 sensor it took around 5 minutes maximum to change . You heav to love stainless steel exhaust . I stopped and bought the sensor and before I left the parts store I squirted the sensor with PB blaster and drove home . The sensor came right out with absolutely no effort whatsoever . I normally dread doing any exhaust work since it aleays ends up a nightmare but with the stainless you are not dealing with a rusty mess . Thanks for the information.
Thread
Thread Starter
Forum
Replies
Last Post
