Question about 2008 Toyota Corolla

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DTC P0101

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  • jakky572 Sep 21, 2008

    Does this mean replacing the MAF or any other component and not a DIY project?

  • jakky572 Sep 21, 2008

    Had a Cone Filter with associated piping installed by non dealer mechanic. I know for sure a sensor with a glass tube resembling a thermometer with electrical wiring needed to be transferred from the stock air filter housing to the new pipe that had a black plastic adapter. The stock air filter housing and black accordian type hose was removed and which I have kept. the cone filter is located in the space to the rear of the battery. All was okay until after a week when the yellow check engine light came on. The mechanic removed the battery negative cable for a few minutes, reconnected the cable and no light. This procedure has been repeated a number of times and the light comes on after traveling approx 20 miles on the odometer. I do appreciate any help you can give me and going back to the stock setup I do not think will help me at this point.

  • jakky572 Sep 22, 2008

    Att hbonz, I will follow your suggestions first thing Monday morning. Thinking I could squeeze extra mileage out of a tankful of gas led me to going to an aftermarket filter kit. This has led to much more than expected headaches. A BIG MAHALO (HEARTFELT THANK YOU) for taking the time to diagnose my problem. I will post results ASAP on Monday 9/22/2008.

  • jakky572 Sep 22, 2008

    Attn hbonz50, MAF pins and connectors checked okay. Stock air filter system reinstalled and the car is out with wife running errands. So far no call on my cell phone regarding the check engine light coming on. I will post again in a few days, got my fingers crossed and give the system a minimum of a week at least since the original problem surfaced a week after installation of the aftermarket WAI system. Mahalo for your timely and very knowledgeable assistance!

  • jakky572 Sep 25, 2008

    Attn hbonz50, No cel light so far! Your help removed the weight on my mind with thoughts of an electrical short to replacement of very expensive components. The old adage, "If it ain't broken don't fix it", holds true in my case. Fortunately the intake kit wasn't one of the more expensive ones on the market. It came with plastic tube reducers which I unfortunately or fortunately did not get to experiment with. I will post again on 9/29/2008. You are surely a lifesaver with your invaluable assistance!

  • jakky572 Sep 30, 2008

    Att hbonz50,

    Today marks a week since reinstallation of the stock air filter intake system and NO CEL LIGHT AT ALL. A heartfelt thank you for your diagnostic and technical assistance!

  • Lobonge Apr 06, 2009

    My 2007 Corolla is running lean after installing an intake system. How do you adjust the air to fuel misture on the car?



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Mass air flow circuit / range performance

Posted on Sep 21, 2008

  • 3 more comments 
  • hbonz50 Sep 21, 2008

    no, but what i was wondering did any body mess with your air filter lately

  • hbonz50 Sep 22, 2008

    it almost sounds like they pulled a wire out of the connector when changing your filter.I would make sure all wires are connected and none of the pins have been pulled out of the mass air flow connector.but i still thank you need to go back to your stock filter. here is why The PCM compares the actual MAF amount with the expected MAF amount when the engine is running.

    – If the throttle opening angle is more than 50 % and the MAF amount is less than 5 g/s {0.66 lb/min}, the PCM determines that there is a MAF sensor circuit range/performance problem.

    – If the ECT is more than 70 °C {158 °F}, the engine speed is less than 2,000 rpm and the MAF amount is more than 130 g/s {17.20 lb/min} (MT) 110 g/s {14.55 lb/min} (AT), the PCM determines that there is a MAF sensor circuit range/performance problem.

  • hbonz50 Sep 23, 2008

    just let me know how things go, i will try to do whatever i can to help.

  • hbonz50 Sep 25, 2008

    glad to help, just let me know how everything goes

  • jakky572 Feb 27, 2013

    My apologies to all of you since it has been a while since I last posted but I solved the problem by using the smallest of the 3 included internal adapters, the 2.25 " ID.



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