MIL will not go off!! PLEASE help!!!

[yz250]

Hey guys heres my dilemma-
I have been battling my 2001 cobra's check engine light for the last several months. I am getting a P0174 code which is "System Too Lean, Bank 2". This is the only code I am getting (I know, its strange). I have added a new fuel filter and the code came back. Sprayed off my MAF sensor, so its OK. The guy at Autozone said its my front oxygen sensor that needs to be replaced. I kinda doubt it though. I hear this code can mean lots of things but all i see is others getting it with the bank 1 code. What the heck can only cause bank 2 to be lean??? Help Im so confused.. Thanks a bunch guys.

 

[Chopper1]

An intake leak on bank 2 would cause this.The O2 sensor would do it also,start with the cheap stuff and change the sensor.

 

[COramprat]

A "slow" O2 would give this code also. Swap the sensor on bank 1 to two and 2 to 1 and see if the code switches to bank 1. That would give you a definative answer or you could test the circuit with a voltmeter to see if the voltage is correct. I'm not sure what the range should be so you may have to search a little...my Haynes is missing so I don't have the values available. If the sensor is bad, I'd change out both bank 1 and 2 upsteam sensors just to be safe.

 

[millatime]

an exhaust leak at the exhaust manifolds will cause this as well so you may want to check for that

 

[Mirrahasmycar]

Check the O2 sensor, it is a possibility, check the connections, check all the visible hoses on the motor on the intake,

 

[yz250]

Thanks guys. I've already bought an 02 sensor from autozone but havent put it on yet. Is it more than likely the front sensor on bank 2? If i put that thing on and the light comes back on im gonna be pissed (plus 50 bucks in the hole). Also, I've heard you have to have a special "tool" for putting on the 02s. I thought you could just use a socket wrench... anybody know?

 

[bbueschel]

No special tool needed.

 

[sil_stang02]

Hey YZ250 Im getting the same damn code. Did you get horrible gas mileage too? Well what did you do to get it fixed? Did the driver side o2 fix it or what? I hope you read this

thanks

 

[trailblazr81]

I used a combination, boxed/open end wrench.

 

[yz250]

hey man-
turns out it wasnt the 02 sensor at all.... it was my damn c&l mass air meter. i put the stock meter back on, and whaddya know? NO MORE CODE!

 

[sil_stang02]

hey man-
turns out it wasnt the 02 sensor at all.... it was my damn c&l mass air meter. i put the stock meter back on, and whaddya know? NO MORE CODE!

thanks man, were you getting pretty bad gas mileage too? IM getting horrible.. also, C&L MASS AIR METER, thats the MAF correct, by the air filter, sorry not too smart with vehicles.

thanks

 

[sgarlic]

Dirty MAF's cause this code all the time.. not only on Mustangs.. pretty much every 4.6 from 99+ will throw it if the MAF gets dirty.

 

[hotmustang331]

It wasnt dirty...its those crappy aftermarket ones. ANY aftermarket MAF should be a lightning 90MM MAF...but since you wont tap the stock meter unless you go S/C, stick with the stocker.

 

[Jackie Chan]

c&l meters...ugh. i had one on my 01 and sold that bish quick. my car would stall when i put the clutch in and ran like crap. I had a pro-m on my cobra when i bought it and swapped back to a stocker, car ran better at the track and idles better too

 

[sil_stang02]

thanks man... Just got my car out the shop it was one of the front o2 sensors, one wire had rubbed off from being to close to the tranny... cost me 150 dlls. but looks like its fixed now. Iwas getting 14 to 16 at best mpg.... I just tested my mpg, and got 23 half hwy, half street, so im happy....:SNSign:

thanks