hi all im new to the world of scooby

i got a 99 2.0l sport wagon last weekend with straght through exhaust and induction kit, I changed from a s13 thinking the scooby would be more reliable and easier to get surfboards on top of lol.

anyway driving about and the check engine light came on, so searched around on net etc and found out about the self diagnostics system so just tried it out and it threw up 32 and 12, a/f sensor and starter system,

now number 32, the a/f sensor is this the part on the air intake before it gets to the engine if that makes sense, little black box held on with phillips screws, are these cleanable? or is it a replacement part? if so where is the best place to get it from?

number 12 the starter system, is there a common problem or a weaker part of the starter system that goes wrong or is it just the starter motor is about to fail lol ?

all and any help is much appreciated. thanks in advance

sam