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I believe my o2 sensors have failed and are causing me to run super rich and therefore get terrible mpg. I'm about to replace them, but with it running as rich as it is, will that be hurting anything else? I haven't noticed any other problems yet but it doesn't hurt to check. Thanks.
 

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If you let it go for 2.5 to 5k miles it can cause the catalytic converters to overheat and die...
 
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