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Lean codes can be caused by vacuum leaks , secondary air injection faults and exhaust manifold leaks.
Lean limit suggests that you have some oxygen (air) getting into the system and the pre-cat O2 is trying to compensate and it is running into the limit because the O2 is coming from the atmosphere and not from the combustion process.
That is where I would start.
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2001 Boxster S 3.6L, Zeintop
"Calling upon my years of experience, I froze at the controls." - Stirling Moss
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