Question about 2003 Chrysler 300M

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I have a 2002 chrysler 300. I just had a water pump & timing belt replaced as well as an oil change and 02 sensor replaced (diagnostic pointed to this). After all the work my car would run rough as if it were running out of gas on an idle or low rpm. I took it to a dealership and they said i needed an 02 sensor that was NOT after market, a Mopar one which I had them install as a software upgrade. It lasted for 34 miles and now the engine light is back on again! Help! Single mom who has just sunk 1400.00 into her car with 0nly 80K miles. Cant afford a trial and error maintenance plan! Why is the same 02 sensor going off again?

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  • Poncherello May 11, 2010

    What trouble code are you getting? Many times the software upgrades don't work. Are they saying there is no part to replace only the software upgrade?

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2 Answers

There is a possiblity another 02 sensor went. This is not a trial and error thing. Stuff happens. I suspect that the timing belt was replaced without lining up the cam gears because they either did not have the tool to hold them while the old belt was off or who knows. The dealer entered the game later not knowing you had other work done or you may have explained to the service writer who knows less about cars than you do. The dealer techs should look for cam data if possible with a scan tool before they assume 02 alone and address your current check light warning. Cam timing will give you all the drivability systems you mentioned. Don't for get a clogged gas filter.

Posted on Sep 28, 2009

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I understand your frustration. O2 sensors are the most oversold car parts on the market. The reason for this is there is never a diagnosis done to find why the sensor went bad. Sensors normally show check engine when the fluctuation of fuel air mixture is beyond the computers pre-set range the computer wants to read. I would check the plug wires, plugs or coil pack. This would cause too much gas to be burned setting off the sensor. Also if one of your fuel injectors is bad, there may not be enough fuel in the mixture. Also would set the light off. In reality there are 100s of things that could make the O2 sensor send a trouble code. I hope this helps you better understand what may be happening with your vehicle.

Posted on Sep 28, 2009

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