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What is causing my cats to go bad

3K views 3 replies 3 participants last post by  r-clar 
#1 ·
Hey All,

I'm fixing to have to replace my cat converters for the second time. These cats have only been on this car for 4 months! I'm getting the p0420 and po430 codes. Which indicates cat insufficiency. What could be the culprit further upstream in the exhaust?
Car burns oil about a qt every 3k miles with no leaks. Could this be an issue? Maybe the injectors are bad? Really I'd hate to just throw partsat her. Any advice will be greatly appreciated.
 
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