P0171 help! - Toyota Nation Forum : Toyota Car and Truck Forums

Arash · 01-11-2012, 12:19 PM

Mass air flow sensor is acting up. I dont know why.

I have a takeada short ram intake with it extended to under the battery.
I have cleaned my original sensor with MAF cleaner and it did nothing.
Then I bought a new sensor (DENSO) original and it still throws me the error code. I Have a scanguageII So i reset it everytime. Yes I unplugged the battery everytime I touched the sensor. (touched = removing or cleaning). I am at witts end. HELP!

BlackCamSe · 01-11-2012, 12:47 PM

That's most likely a vacuum leak. If extra air gets into the engine after the MAF that the ecu doesnt know about the engine will run lean. If it was a MAF then it would most likely be accompanied with p0101

Arash · 01-11-2012, 12:49 PM

So i should check all my vacuum hoses connected to the air intake?

Arash · 01-12-2012, 05:18 PM

turns out the two hose clamps before the sensor had become REAL loose. tightened them up and cleaned everything one more time and the problem seems to have gone away!

BlackCamSe · 01-12-2012, 09:25 PM

Quote:

Originally Posted by Arash

turns out the two hose clamps before the sensor had become REAL loose. tightened them up and cleaned everything one more time and the problem seems to have gone away!

Good. Glad I could help man.

Arash · 01-12-2012, 09:57 PM

Quote:

Originally Posted by BlackCamSe

Good. Glad I could help man.

im very thankful for your assistance. Thanks!!!

Arash · 01-16-2012, 05:36 PM

Quote:

Originally Posted by BlackCamSe

Good. Glad I could help man.

I need your help again, I get the code P0101 this time.. Im going out to get a PCV valve and replace the one I have.. Any ideas?

EDIT: Just found out where the valve is.. NVM Not being replaced. What could it be?

BlackCamSe · 01-17-2012, 07:44 PM

Quote:

Originally Posted by Arash

I need your help again, I get the code P0101 this time.. Im going out to get a PCV valve and replace the one I have.. Any ideas?

EDIT: Just found out where the valve is.. NVM Not being replaced. What could it be?

p0101 is Mass Air Flow (MAF) Circuit Range/Performance Problem. Is that the only code? And are u absoutely positive that there are no vacuum leaks downstream of the sensor? I'd clean it up with MAF cleaner and reset the code and see what happens.