Are talking about the removal of condition from a conditional green card? If yes and it is denied, you will always have a chance to present a case before immigration judge. Even his or her decision can be appealed before the Board of Immigration Appeals. This is a beauty of our system. It gives us the opportunity to be heard before different entities.
If your i751 is denied you are sent to immigration court where a judge can review the case. Better to meet with a lawyer now and do everything you can to get your case approved.
1. Hire an attorney immediately. Make sure your attorney is licensed.
2. Have your attorney prepare to appeal your case and go before the IJ. You should have had your attorney prepare this for you when you did the I-751. This is not a game. Immigration Court is the scariest court in the country.