Generally, PO101 is a code for a Mass Air Flow sensor problem. I don't know if your car has one.
The code means the computer does not see the amount of air coming into the intake that it thinks should be happening.
Sometimes it is a failed sensor, sometimes it is a leaking hose or restricted air filter.
Hi there:
DTC P0101 - Mass Air Flow (MAF) Circuit Range/Performance
Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 4.0 seconds.
This code refers to the mass air flow sensor. It is usually either an intake leak after the mass air flow sensor, a dirty throttle blade or a faulty mass air flow sensor. I would start by having the throttle cleaned. Be sure carb cleaner is sprayed onto a rag and the throttle blade and bore are wiped clean.
Other possible solutions, the simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures. Inspect for the following conditions:
An incorrectly routed harness--Inspect the harness of the MAF sensor in order to verify that it is not routed too close to the following components:
- The secondary ignition wires or coils
- Any solenoids
- Any relays
- Any motors
A low minimum air rate through the sensor bore may cause this DTC to set at idle or during deceleration. Inspect for any vacuum leaks downstream of the MAF sensor.
A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor g/s display on the scan tool to increase rapidly. This increase should be from 6-12 g/s at idle to 230 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.
The barometric pressure (BARO) that is used in order to calculate the predicted MAF value is initially based on the MAP sensor at key ON.
When the engine is running the MAP sensor value is continually updated near WOT. A skewed MAP sensor will cause the calculated MAF value to be inaccurate. The value shown for the MAP sensor display varies with the altitude. With the ignition ON and the engine OFF, 103 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude.
A high resistance on the ground circuit of the MAP sensor can cause this DTC to set.
Any loss of vacuum to the MAP sensor can cause this DTC to set.
Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.
Thank you for using FixYa, have a nice day.
The
common fix for this code is to check the integrity of
the heater wires. Check the wires for insulation and routing
which could be loose or touching a hot exhaust that can
short the wires. If the engine has too many miles, it
is possible that the heater circuit inside is worn and
shorted which needs a replacement of the oxygen sensor.
If you have a DVOM, you can also test the continuity of
the heater wires from the oxygen sensor to your computer
pins.442 views
Usually answered in minutes!
×