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CEL CODES P0420, P0402

Discussion in 'Technical Chat' started by dustinclm, Dec 14, 2010.

  1. Dec 14, 2010 at 9:33 AM
    #1
    dustinclm

    dustinclm [OP] Well-Known Member

    Joined:
    Apr 4, 2010
    Member:
    #34553
    Messages:
    500
    Gender:
    Male
    Thibodaux, La
    Vehicle:
    2012 Super White DC 4x4 V6
    Bilstein 5100 set at .85" WeatherTech Floor Mats
    P0420 - catalyst system efficiency below threshold - bank 1
    1) air leak in exhaust before rear H02s bank 1
    2) af sensor error
    3) fuel system fault
    4) faulty cat
    P0402 - system fault exhaust gas recirculation - too much flow on EGR
    1) EGR valve stuck open
    2) failed EGR pressure sensor, or valve or pressure sensor

    thats whats i got this morning and was going to take a look at it this afternoon but i dont know where to start. any help would be appreciated...im pretty handy so i think i can get it fixed but just not sure where to begin....any one had these problems before?
     
  2. Dec 15, 2010 at 10:56 PM
    #2
    The Munster

    The Munster I like turtles!!!

    Joined:
    Oct 7, 2010
    Member:
    #44355
    Messages:
    140
    Gender:
    Male
    First Name:
    Lance
    Moody AFB, GA
    may be 02 sensor. but its probably your cats. problem is if it is your cats you'll have to get factory ones, which are like a grand each
     
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