Question about 2004 Pontiac GTO

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2004 gto ls1 motor is running rich and dtc code is P0131

2004 gto ls1 5.7L motor is running rich (strong gas smell out of tail pipe and poor throttle response) and dtc code is P0131 which is low voltage bank one sensor one oxygen sensor. I switched front o2 sensors front driver to passenger sides and code did not change which would appear to indicate sensors are okay but bank one wiring problem. I tested both ground wires on both sides (both driver and passenger sides) and they appear to be okay. White wire on both o2 sensors indicated no voltage and blue wire on both o2 sensors only indicated 1 volt. I was told that blue wires should show 12 volts and white wires should show 5 volts. What next????? Do I need to get an analyzer such as Auto Tap Pro which will show graph of o2 sensors on computer screen??? What do you recommend. Thanks, Robert

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  • gregoryjl Dec 30, 2008

    i have a problem with my 2004 gto, when i start it, it starts for a second then stops, it takes like 10 times to keep it going. it acts like its not getting any gas. so whats the deal.

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That would be your best bet it is very hard to diagnose a injected v8 with out the right equipment but speaking from experience ( due to the fact we in Australia built these cars) the oxy sensors cause all sorts of problems and swapping them over does't necercarly prove much

Posted on Dec 20, 2008

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