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Thread: p0420 hell what do i do plz help !!!!!

  1. 2002 beetle
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    p0420 hell what do i do plz help !!!!!

    06-23-2012 11:13 PM #1
    im trying to sell my wifes beetle but i have to get it smoged 1st and i keep getting the code p0420 and i replaced both O2 sensors and cleaned the MAF sensor and the code keeps coming back every 70 - 75 miles , the car has 109xxx and its a 2.0 motor any help would be great
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  3. billymade
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    06-24-2012 01:56 AM #2
    16804/P0420/001056
    Contents [hide]
    1 16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold
    1.1 Possible Causes
    1.2 Possible Solutions
    1.3 Special Notes
    16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold
    Possible Causes
    Leakage in Intake and/or Exhaust System
    Catalyst faulty
    Oxygen Sensor(s) faulty
    Oxygen Sensor(s) Control faulty
    Possible Solutions
    Check Intake and Exhaust System for Leaks
    Check Catalyst
    Check Oxygen Sensor(s)
    Check Oxygen Sensor(s) Control
    Perform Oxygen Sensor(s) Aging Check

    Have you checked the two things above?
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  4. Rockerchick
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    06-24-2012 09:12 AM #3
    P0420 is usually a bad catalytic converter.

    Sent from my SCH-I405 using Tapatalk 2
    Quote Originally Posted by TM87 View Post
    VW-making mechanics out of owners since 1957.
    The project - '84 Jetta 1.6TD, 186k+, fully rebuilt, Giles IP and injectors, 2.5" custom exhaust, 51mpg
    Hers - '03 BMP 20thAE GTI, 125k, all stock...for now
    His - '01 Jetta TDI, 126k. Now has 3 pedals, as it should!
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  5. 2002 beetle
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    06-24-2012 02:08 PM #4
    Quote Originally Posted by billymade View Post
    16804/P0420/001056
    Contents [hide]
    1 16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold
    1.1 Possible Causes
    1.2 Possible Solutions
    1.3 Special Notes
    16804/P0420/001056 - Catalyst System; Bank 1: Efficiency Below Threshold
    Possible Causes
    Leakage in Intake and/or Exhaust System
    Catalyst faulty
    Oxygen Sensor(s) faulty
    Oxygen Sensor(s) Control faulty
    Possible Solutions
    Check Intake and Exhaust System for Leaks
    Check Catalyst
    Check Oxygen Sensor(s)
    Check Oxygen Sensor(s) Control
    Perform Oxygen Sensor(s) Aging Check

    Have you checked the two things above?
    how would i go about checking for leaking ?
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  6. billymade
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    06-24-2012 08:32 PM #5
    Take a look at these videos; hopefully, they will give you some ideas... there are 13 steps in the video series "Emissions Control Diagnostic Process" here: http://www.youtube.com/user/TennecoInc?feature=watch

    Here are some to start with:

    http://www.youtube.com/watch?v=npHSC...hannel&list=UL

    http://www.youtube.com/watch?v=s6xP8...feature=relmfu

    http://www.youtube.com/watch?v=TjPL4...feature=relmfu

    http://www.youtube.com/watch?v=dwNDGktbFn8
    Last edited by billymade; 06-24-2012 at 08:37 PM.
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