ask a favor to you?
1.Can I ask a favor of you?
2.Can I ask a favor to you?

which one is right?
#2 is still fine?

Question

ask a favor to you?
1.Can I ask a favor of you?
2.Can I ask a favor to you?

which one is right?
#2 is still fine?

Answer

1 is colloquially correct.  'May I ask a favour of you?' is better.

2 is always wrong.

Answer

1 is correct
The other ways the same can be expressed are:
Can I ask you for a favour?
Can you do me a favour?
Can you do a favour for me?