Question about 2005 Pontiac Grand Prix
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.
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
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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Posted on Jan 02, 2017
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