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Okay, so i've had a check engine light on for a while, and finally got it scanned.

The codes that came back were

P0420 - catalyst control system below threshold (bank 1).

I have a 2005 cobalt, 2.2 litre. What are the chances it's actually the catalytic convertor, and not the downstream o2 sensor? The o2 sensor is $50 for a delphi one, and the convertor is $400. I'm debating on spending the $50 for the o2 sensor just to see if that's the problem, but if it's just gonna be another $50 wasted (I was told by autozone that it was the upstream o2 sensor throwing that code), than I might as well just spend the $400 and be done.

My state doesnt require emissions, so I don't qualify for the 8yr 800000 mile federal replacement warranty :(

Also, another code that was thrown, I can't remember the number, but it described it as this:

Evaporative Emission Control System Leak Detected (Large) - Occassionally, when driving, the car will ding and the 'check gas cap' light will come on, even though the cap is down as tight as it will go. Would a 'large' be classified as a faulty gas cap gasket, or is it something else somewhere.
 

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Personally I would, if you have the money to spend $400 right away do that. If you don't take the chance with the $50 one and see if that works. If yes, then you saved $350. If not you only spent $50 extra and you can wait awhile while you get the money. But $350>$50.

Just my advise. For what its worth.
 
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