Air/Fuel ratio Problem NEED HELP

[BMWHATR]

I have a 3" exust w/ no cat so my check engine comes on once in a while. but the majob problem is that my turbo has 3 small cracks and 1 big one about 1.5" i took it to the shop and they guy said it was overheated. whats the problem? can the exust sensor effect ur A/F ratio? how do i know if my ration is good. by the way i am all stock

 

[kpt4321]

What?

You just posted a whole bunch of different random information/ questions, and I honestly am not quite sure what you want.

The oxygen sensot effects your AFR in closed loop.

The cracks are from age and heat.

 

[LandoAWD]

What?

You just posted a whole bunch of different random information/ questions, and I honestly am not quite sure what you want.

The oxygen sensot effects your AFR in closed loop.

The cracks are from age and heat.

Agreed. Pose a specific question in a legible manner when you get your thoughts together.