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  1. 4.6L Tech
    Ok guys, i know this is like the 2nd time i've started a new thread in the past like 3 days, but i'm totally stuck.. My car keeps throwing the code 'P0135 and P0155'. 'O2 Sensor Heater Circuit malfunction' So that means both of my front o2 sensors are having problems. I replaced ALL 4 02...
  2. 2005-2010 Mustang GT Tech
    I'm still mostly a newbie, so I'm not sure what to do for these codes. None of these problems came up until a couple days after the LTs and Midpipe got installed. p0114 p0155 p0161 p0430 I was told that 155, 161, and 430 all pertain to the cats and that one might be malfunctioning. I...
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