Quote:
Originally Posted by mattfwalters
Can't be certain, but my guess would be that "sensor stuck rich" code is the more causal one. If the computer is trying to trim out a nonexistent rich condition caused by a bad sensor, the (still good) post-cat sensors screaming about an actual lean condition make sense.
Both post-cat sensors reading a lean condition is bad, regardless. Don't drive the car like this.
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I have no mufflers so I guess the post errors are not relevant or harming the engine.