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Check engine and traction control light

Discussion in 'Technical Chat' started by MIAtaco, Jan 20, 2013.

  1. Jan 20, 2013 at 12:56 PM
    #1
    MIAtaco

    MIAtaco [OP] Well-Known Member

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    2.75" front lift 2.5" rear, pro comp es3000 rear shocks w/ orange shock boots, custom exhaust, k&n cold air intake, 20" led light bar behind grill, aftermarket grill, T-rex3 eyelids
    I recently had to hit my brakes pretty hard and the tires skidded slightly and then my check engine and traction control lights came on and is throwing a catalyst function code is coming up. Any idea what's going on?
     
  2. Jan 21, 2013 at 8:26 AM
    #2
    Vstrom30

    Vstrom30 Well-Known Member

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    It may just be a coincidence that the CEL came on soon after you hit the brakes. Those lights all usually come on in conjunction with each other because when there is an engine fault, the ECM sends a code to the ABS/TRAC/VSC computer telling it to stand down, and this code is C1201, unless there are additional things going on with the ABS. Now we need to know which catalyst is below threshold. With yours being a 2010, the catalyst may still be covered under 8 year/80k emissions warranty.
     
  3. Jan 21, 2013 at 8:39 AM
    #3
    MIAtaco

    MIAtaco [OP] Well-Known Member

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    the code thats popping up is a p0240
     
  4. Jan 21, 2013 at 8:53 AM
    #4
    Vstrom30

    Vstrom30 Well-Known Member

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    I'm assuming you mean P0420, and your truck only has 1 bank. There is a good possibility that the catalyst is weak. The other possibilities are a leak in the exhaust pipe, or faulty A/F or o2 sensors. If you are under 80k miles, and it needs a cat, it should be free replacement due to federally mandated emissions warranty.
     
  5. Jan 21, 2013 at 8:55 AM
    #5
    127.0.0.1

    127.0.0.1 AKA ::1

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    you sure it is p0240 ?

    P0240 Turbocharger Boost Sensor B Circuit Range/Performance



    if it is p0420, then

    a) most likely, the o2 sensor itself is on it's way out. they have a finite life anyway,
    or it's clean air sample port is dirty or has been underwater....

    b) less likely, the cat is on it's way out. but cats last far longer than o2 sensors, generally
     
  6. Jan 21, 2013 at 11:33 AM
    #6
    Vstrom30

    Vstrom30 Well-Known Member

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    Also, how custom is your exhaust? Any possibilities of leakage?
     
  7. Jan 21, 2013 at 1:36 PM
    #7
    MIAtaco

    MIAtaco [OP] Well-Known Member

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    Yeah p0420 and there is a small leak but not anywhere near an oxygen sensor and the cat is only 3 months old
     
  8. Jan 21, 2013 at 1:47 PM
    #8
    127.0.0.1

    127.0.0.1 AKA ::1

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    p0420 sniffs the results of the cats, and that is it's only function

    fuel and engine control comes from the front sensor before
    the first cats
    ---
    anyhow

    I will bet that the o2 sensor itself is toast. need the exact same denso part number
    for best results (aftermarket sensors are a crap shoot, might still throw a code)

    so...

    if no air/exhaust leaks between the first sensor, the cats, and this o2 sensor,
    I'd bet it is the sensor itself, 150 bucks give or take
     
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