The bank must have been already informed that your are being cancelled so they will get you to pay all the debt before departing Qatar.

If there is no settlement between you and them then you could expect to be detained at the airport, and even do jail time.

Just be careful...go to the bank...get a settlement with them...or sell the car and repayback the loan to the bank.

Or sell the car to someone willing to take over the loan.

Regards!!