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

    1. 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

    2. Member
      Join Date
      Jan 29th, 2008
      Posts
      489
      Vehicles
      02' New Beetle Turbo S
      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?

    3. Member Rockerchick's Avatar
      Join Date
      May 10th, 2005
      Location
      Cary, NC
      Posts
      5,040
      Vehicles
      '03 BMP 20th GTI, '84 TD Jetta
      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, 130k, 3" 42DD turbo back, Unitronic Stage 2
      His - '01 Jetta TDI, 135k. Now has 3 pedals, as it should!

    4. 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 ?

    5. Member
      Join Date
      Jan 29th, 2008
      Posts
      489
      Vehicles
      02' New Beetle Turbo S
      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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