I have a 2001 Ford F150 XLT with a 4.2L manual trans I am have a problum for the drive cycle to compleate I have a NGS scanner and 3 mo ago i clean the o2 sensor the check engine light has not came on for 3 months i need to take to Arizona emission but the ready status in the evap o2 sensor and catalatic converter will not check to ready compleate status the catallitic coverter and mas airflow sensor and all 4 o2 sensor have been replace in the last year do you know of any TSB or correction download flashes thant will cure this i have followed the ford recomendation proceadure on clearing po1000

P0100 OBD-II Trouble Code

Technical Description

Mass Air Flow (MAF) Circuit Malfunction

Basically this means that there's a problem with the Mass Air Flow (MAF) sensor or circuit.

You will likely not notice any serious driving problems, but there may be symptoms like a general decrease in power or sluggishness.
Causes

A code P0100 may mean one or more of the following:

* The MAF may be disconnected, or a wiring connection may be bad.
* The MAF sensor may be faulty.

Possible Solutions

Use an OBD II Reader (or go tou your local parts store and they will for free) and reset the code and see if it comes back.
Then start with the cheapest, easiest repair procedures:

* Check the Mass Air Flow Sensor wiring/harness is connected properly and that there are no broken / frayed wires.
* Unplug and reconnect the MAF wiring harness a few times to clear the contacts.
* Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information).
* Replace the MAF sensor.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.
!@@@