Why do I not have reverse on my 2006 Mitsubishi Outlander with automatic trans

An issue like this will require extensive knowledge of how a transmission works but first you need to verify that the car is actually in reverse. You could have a shifter or linkage issue so look there first. If it is clicking into reverse you will need to start with a a scan of the system but ultimately you will need to bring this to a shop. If you don't work on your own car then use this link to find a good shop near you. https://repairpal.com/repair-shops Alex