CHECK ENGINE LIGHT ON- PO172, Lean Bank 1???

[Nick95GT]

Does anyone know what PO172, Lean Bank 1 could be? My check engine light randomly comes on and off when im driving and i had it checked out and they told me the code and said that it would take another hour or two to do a full diagnostic on the car to see whats wrong but they said it could be a vaccuum leak or something wrong with the intake...i had to be somewhere so i left and they wont be able to look at it till next week. Ive also noticed that my car seems to "stutter" sometimes or it seems like the engine might be a struggling a little bit, and every once in a while when im accelerating it sounds like it will stutter and the rear axle will make a quiet pop noise and i know somethins acting up every once in a while...could this have anything to do with the check engine light?

 

[desertcox05]

clean the maf. it's possible a vac leak could cause it too. do the maf and iac first and see how that reacts.. how old is the tune up? it's good to have a solid base before you start throwing parts at it.

 

[Chern_889]

See my post in the other thread, definatly a dirty MAF, i had the EXACT same problem, Make sure you take it apart and physically clean it with a Q-tip, just spraying cleaner into the housing isnt going to cut it

 

[legalize420]

sounds like a bad o2 sensor. simple test would be to swap them from one side to the other and see if the code follows.

 

[Don 95Vert]

Check all of the above and I'll add look for an exhaust leak ahead of the 02 sensor. It'd leak atmospheric 02 into the exhaust causing a false lean condition...

 

[Nick95GT]

i just cleaned the MAF sensor today and it seems like its running a little smoother and better but that deffinitly didnt fix the problem cause my check engine light is still on...now since thats out of the way it has to either be a vacuum leak or exhaust leak i would guess...not sure what it is but i hope its a cheap fix

 

[shttygtstang]

Ya have to reset the ecm . If it pops up again then it isnt fixed.