It's a felony conviction until you have satisfactorily completed probation. Even then the arrest may show up on your record as a felony arrest.

Yes you can be charged with possession under the facts you have set forth here. Hire an attorney.

How to take care of warrant

You put it back on calendar to have the warrant re-called and to deal with your petty theft case. An attorney would help.

Dose a defendant have to appear in court for his motion to terminate probation

If the PD's office is going to file a PC 1203.4 for you why don't you use them for an early termination of probation? Doing it yourself just...

Will I go to jail for being arrested for speeding and having a loud exhaust ?

I doubt this kind of infraction will constitute a violation of your probation. Slow down and fix your exhaust.

Can my friend avoid jail time with 4th dui? And how long can he hold out til he goes to trial?

It's his 3rd dui. If he's convicted there is no way to avoid jail time. Sounds like your friend needs a lawyer and some AA meetings.

Credits can be confusing. If your bf got a 16 month sentence at half-time he has to serve 8 actual months. As for the county time he served only...

Is it possible to file for just 17b reduction in Los Angeles County?

You can re-apply for the reduction although you should hire an attorney to do it for you. You clearly don't know what you are doing.

How to get the PFEC forms to submit.

Have you ever heard of google? Type in CA PFEC and you will find all the information you need.

Yes you can lose your section 8 housing. Worse you could have trouble maintaining custody of your children.