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i noticed my check engine light came on this evening, no idea why,i cant tell a difference in the driving, its not running hot, no odd noises,although i feel like i went from getting 20 +mpg to like 10...but that may just be in my head i manually got the light to tell me the codes and got 0430 and 0328 , if anyone could tell me what these codes mean, ive got an '02 and it didnt come with a manual and help would be greatly appreciated
 

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The first points to either your cat or downstream O2 sensor
http://www.obd-codes.com/p0430

The second is your knock sensor
http://www.obd-codes.com/p0328
Is your '02 supercharged?

I'm sure some of the gurus here will chime in with a great solution for both, but in the meantime that site should give you an idea of what you're looking for
 
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