Need help with engine error codes on 99 boxster

[landrovered]

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.

[landrovered]

It would appear that HUALE768 is an even smarter spam bot that is now combining posts in a thread to be harder to spot. Amazing what hackers can come up with.

[Pianohawk]

Thank you for your replies! I'm going to try and clean out the MAF sensor this week and cheek the fuel relays as you suggested.