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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.
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.
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