Question NEED HELP ON MY TRUCK PLEAS

Discussion in 'Technical Department' started by Carlos1398, Jul 15, 2017.

  1. Carlos1398

    Carlos1398 New Member

    Posts:
    4
    Likes Received:
    0
    Joined:
    Jul 15, 2017
    Location:
    Houston
    I have a issue , my truck is an 2005 GMC Sierra 5.3 I have 200k on it and it was coming up with codes with knock sensors and maf sensor and o2 sensors too. So it was bogging down real bad when i floor it all the way w.o.t adn bog so i decided.To replace all 4 o2 sensors and the 2 knock sensors with harness. and also change the k&n filter new also. And now its coming up with a code p0420 the only thing i can think of is my cats being clogged . but dont know . When i floor it the rpm's go up but doesn't go like it bog down?
    I wen t ahead and order the Flowmaster y pipe for it just info for you.


    HHHHeeeelllllp? please
    Appreciate all the feed back you guys
     

Share This Page