Join Date: Sep 2008
Location: Chesapeake Va
Drives: 04 Kia Rio (my babe)
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My cel has come back on a few times after i have reset it. I have cleaned the maf sensor twice already and it comes back but it onlt does when i get on the highway. I have a k&n cone air filter and I heard that if the filter has to much oil on it that the excess oil will come off the filter and hit the sensor contaminating it. I reset the ecu, cleaned the sensor and allowed it to dry over night and went out for a while but i didnt go on the highway. I went to a local shop (that I trust) and had the ecu checked out and it that sensor came up as ready (working correctly). I got on the high way after that and the cel came on and displayed P0101. I put about 50 miles on it from resetting the ecu to getting on the highway. Now the day after, I cleaned the sensor again and reset the ecu, drove around adding about 10 miles before I got on the highway. Once I got on the highway, it came back on. Ironicaly the same general area as well. I was thinking that considering that I havent cleaned the filter in 5 months, the dirt maybe coming off the filter and contaminating the maf when I get to highway speeds. So, im debating on getting a new filter and getting the code erased from the ecu. If I get the code erased, will it come back up if the filter didnt fix the problem o will it as if the maf doesnt exist anymore.
I think the only way you're going to get rid of that code is to return it to stock.
DTC description for P101: The ECM compares the actual measured Mass Air Flow signal to the modeled Mass Air Flow value and sets the DTC P0101 when the difference between these two value is too high or too low with lambda deviation in opposite direction. The ECM illuminates the MIL on the second consecutive driving cycle that the diagnostic runs and fails.
The modeled Mass Air Flow value is determined by engine speed, throttle angle and ISCA duty.
The ECM is seeing the MAF signal is too high because that is what a cone air filter is supposed to do, bring in more air. During city driving, the value is higher than normal, but not enough to light the CEL. During highway driving, its way out of specs and lights the CEL.
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