CEL -> DTC P0171 -> clean the MAF -> happy

Discussion in 'Generation 1 Prius Discussion' started by AldPixto, Sep 12, 2019.

  1. AldPixto

    AldPixto Junior Member

    Joined:
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    2002 Prius
    vehicle: 2002 prius

    After some aggressive green light dashes my check engine light (CEL) came on. I ran TIS and found one DTC, P0171, lean fuel mixture, bank 1. Sounds dreadful, but thanks to numerous postings here on PriusChat and elsewhere I decided to clear the code and clean my Mass Air Flow (MAF) meter/sensor. I purchased the recommended CRC MAF spray cleaner.

    For novices, like me, the MAF is located below the front edge of the air cleaner box, held on with two phillips head screws (PH#2 seems to fit the best.) I detached the MAF, sprayed it, let it dry for an hour. Re-lubed the o-ring on the MAF, put a spot of loctite 20190908_124440_prius_MAF_meter.jpg on the screws, and re-attached it.

    I've driven a few days and about 30 miles and the CEL hasn't come back on.
     
    mroberds and Raytheeagle like this.
  2. Sandy Meyers

    Sandy Meyers Member

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    I
    Well, that’s great news!
    It’s so fulfilling when you know you beat the Toyota guys on this one.
    Thanks for posting this one.
     
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