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P0402 code, how urgent?

Discussion in 'Technical Chat' started by abledsoe, Dec 22, 2012.

  1. Dec 22, 2012 at 9:06 AM

    abledsoe [OP] New Member

    Dec 22, 2012
    1999 PreRunner
    My Tacoma:
    1999 PreRunner 2.4L auto, 157K miles.

    A couple of weeks ago the CEL came on. The truck seemed to be running as normal but I went ahead and took it to my mechanic (not a toyota dealer). He said it gave an EGR code so they checked the system and found nothing wrong, suspected a stuck valve. They cleaned it and reset the CEL. A couple of days later the light came back on, still seemed to be running just fine.

    I borrowed a diagnostic scanner and got code "P0402" suggesting the same thing.

    Im not much of a mechanic at all so fixing it myself is probably out of the question. How urgent is it that I get this fixed? Can it wait about a month? Like I said, it seems to be running just fine, no loss of power or anything. I don't put very many miles on this beast but I do really want it to last another few years.

    Any thoughts? Thanks so much
  2. Dec 30, 2012 at 11:09 AM

    BamaToy1997 ASE Master Tech Vendor

    Jan 31, 2012
    First Name:
    Navarre, FL
    1997 Tacoma 4X4 AKA "Blue Beast"
    Multi-point tow hooks, new bored 2.7L engine, custom paint. 3 inch adjustable Fabtech front coils, 2.5 inch rear AAL. Front Aussie locker. LED bed lights. Full LED conversion interior and exterior. Relentless Fabrication front and rear bumpers. 4X4innovation sliders. BAMF bed rack. CVT rooftop tent.
    P0402 is for excessive EGR flow detected. This is an emissions related code. If there actually IS too much flow it can cause excessive emissions and possible stumbling and hesitation. Can it wait a month? Possibly. It is hard to tell because we don't know if the fault is a true failure, or a sensor problem. If it is a sensor problem, then you could wait, if it is a failure, then it may get worse.
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