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456 Posts
if it was a cat it would make sense that the 02 sensor code popped up. hit it with a rubber hammer and see if lovely noises are heard. other than that, when one of the lines for my BOV was messed up, i would only pull at around that same rpm your saying. could very well be the bov or the line for signal to it, but i dont know anything about cobb bov's so...
