Question about 2005 Pontiac Grand Prix

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2005 pontiac Grand Prix, check engine light on, Catalytic convert

Hi All,

My wife has a 2005 Pontiac Grand Prix GTP. Recently the check engine light came on. I took the car up to Auto Zone to have them check the code in the computer. It read back Catalytic Converter. The guy at Auto Zone said it could be spark plugs, wires, ignition coil, or either one of the o2 sensors.

Today, the wife started complaining about her mpg being way down. However, I have not witnessed this personally because I do not drive the car daily...

I have had some work done recently to it at the dealership (non-related - had the heads up display fixed) and called back to speak with the same person that helped us. Giving them the same info I am giving you all, they seem to think it is the ignition coil. They are willing to diagnose the problem for free but you know how these things go... they say it's one thing, then the next thing you know you have replaced the whole ignition and exhaust system.

Also, the car has never, to the best of my knowledge, misfired and still seems to have plenty of power and no odd noises or smells.

I am thinking these symptoms sounds like an o2 sensor but I just wanted to check and see what you all think.

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  • 2 more comments 
  • cwanitshka Jul 21, 2009

    I am not sure what the code is as it has been a couple of weeks since I had it up there - I just wanted to make sure it was the emissions and not something more critical. I am planning on having the guys from the dealership look at it tomorrow and will let you all know what they say.

  • cwanitshka Jul 21, 2009

    Is that as simple as just taking the terminals off the battery or is that something I will have to have them do at the dealership?

  • yadayada
    yadayada May 11, 2010

    GREAT IDEA, BUT WITHOUT A LIGHT BACK ON CHANCES ARE THE CODE IS GONE AND YOU WILL WASTE YOUR TIME, REMEMBER THIS AN THE O2 SENSORS ARE BEFORE THE CATALYTIC CONVERTER'S, THE SENSORS AT THE BACK OF THE CATS ARE VERY DIFFERENT IN HERE FUNCTION THEY ARE CALLED CATALYST EFFICIENCY MONITOR'S.

  • yadayada
    yadayada May 11, 2010

    those kids at auto zone don't know squat about these types of electronic engine control issues, why would you listem to them, very foolish on your part, what is the code? let a trained tech look at it.

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Tuneup time is around 90,000 to 100,000 miles.If it were to ignition coil you would feel the misfire. Plugs, wires, airfilter and fuel filter should be changed before cat is. Plugs will tell the story.

Posted on Jul 21, 2009

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What i think is you should have the codes erased (if it has not ben done already) and drive it until the chk. engine light comes on again and then have it scaned again, sometimes a senser is late to work and will thro a code witch may or may not have anything to do with a problem that you have discribed. Before you start throing money at it do that first.

Posted on Jul 21, 2009

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Replace both sensors and have all the code 's reset ( they can do this at a inspection center) after you replce the O2 sensors !!! swampratt200!!AAAEEE!!!

Posted on Jul 21, 2009

  • swampratt200 Jul 22, 2009

    It needs to be done by inspection center or dealership to be completely code free!!swampratt200!!AAAEEE!!!!

  • swampratt200 Jul 22, 2009

    hope this helps

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