I went to reverse and on my dispaly it said transmission failure, then i checked the codes that came up and they were

• P0171-Air fuel mixture lean
• P0720-Low output speed sensor
• P2160-High output sensor
• P0000-???

I have no idea what is happening. The shifter will engage to all gears except i have no power on reverse now only idle. I have full power on Drive. What is wrong???