I have an 01 dodge durango with a 4.7 and these are the codes it is giving me and I would like to know what they are p0551 p0121 p0455

i have an 01 dodge durango with a 4.7 and these are the codes it is giving me and i would like to know what they are p0551 p0121 p0455

P0551 indicates a fault detected within the power steering pressure switch system.
What power steering system symptoms do you have, if any?
P0455 indicates a possible large leak detected by your vehicle's evaporative emissions system. Do you have any you can share?
P0121 indicates a fault with one or more of your vehicle's sensors that may require access to engine data stream information. Do you have access to an appropriate scan tool? Can you view streaming data about your car? Who is doing the diagnosis?