gregnash
Anal Retentive Analyst
Ok so I had a CEL pop up at the beginning of March literally days before I left for Hurricane, UT.... P0171 which is a kind of vague code that points to a "Bank One Lean condition".
This can be a whole variety of things from a faulty MAF, faulty O2 sensor, Vacuum line leak, faulty PCV Valve/hose, etc. so I have started going down the rabbit hole of trying to diagnose.
Since the O2 sensors are kind of a bear to get to (especially the bank 1, sensor 1) I figured I would go for that first. I purchased a new OEM from Toyota but it didn't resolve the code.
Next was the MAF, which has been cleaned multiple times and still popped the code so I purchased a new OEM from Toyota but it did not resolve the code either.
I didn't know the age of the air filter so I just went ahead and replaced prior to the Hurricane trip with a VatoZone STP filter, old one was random brand not OEM.
So now I am looking to see what could be the next thing to try. I have checked vacuum lines previously and found nothing that would indicate a vacuum leak on but will likely try again tonight (or this week). But outside of that I am kind of at a loss as to what to try next without just throwing money at parts in hopes that ONE of them is the issue.
Here is a list of possible items for a P0171 per my BlueDriver OBDII scanner..
Untitled by Greg Fisicaro, on Flickr
Something to note is that just before the code pops (and then after) she starts to idle rough. During driving there is no weird or rough feeling, no loss of power or anything like that so figure that if it was something like a bad injector(s) then I would feel a loss of power throughout the powerband. Plus I have run fuel injector cleaner and fuel system cleaner through the tank every few tanks without any resolution. I hear not whistling or any other noise that would indicate to me that there is a vacuum leak (like I would hear on my FJ60s 2F) so maybe Fuel Filter? Aside from TB/WP service being done some weeks beforehand, there was no other major work that had been done to the engine prior to that, which is why I am a bit stumped.
This can be a whole variety of things from a faulty MAF, faulty O2 sensor, Vacuum line leak, faulty PCV Valve/hose, etc. so I have started going down the rabbit hole of trying to diagnose.
Since the O2 sensors are kind of a bear to get to (especially the bank 1, sensor 1) I figured I would go for that first. I purchased a new OEM from Toyota but it didn't resolve the code.
Next was the MAF, which has been cleaned multiple times and still popped the code so I purchased a new OEM from Toyota but it did not resolve the code either.
I didn't know the age of the air filter so I just went ahead and replaced prior to the Hurricane trip with a VatoZone STP filter, old one was random brand not OEM.
So now I am looking to see what could be the next thing to try. I have checked vacuum lines previously and found nothing that would indicate a vacuum leak on but will likely try again tonight (or this week). But outside of that I am kind of at a loss as to what to try next without just throwing money at parts in hopes that ONE of them is the issue.
Here is a list of possible items for a P0171 per my BlueDriver OBDII scanner..
Untitled by Greg Fisicaro, on FlickrSomething to note is that just before the code pops (and then after) she starts to idle rough. During driving there is no weird or rough feeling, no loss of power or anything like that so figure that if it was something like a bad injector(s) then I would feel a loss of power throughout the powerband. Plus I have run fuel injector cleaner and fuel system cleaner through the tank every few tanks without any resolution. I hear not whistling or any other noise that would indicate to me that there is a vacuum leak (like I would hear on my FJ60s 2F) so maybe Fuel Filter? Aside from TB/WP service being done some weeks beforehand, there was no other major work that had been done to the engine prior to that, which is why I am a bit stumped.
