Hello Valk...I am a new owner and have been trying to absorb as much as i can in short amt. of time....The skreem unit seems to be a big problem for these cars...The spare Skreen you have, will it work with the keys/ fob that you are using now? I have 3 keys / fobs that came with the car, i want to have a spare, just in case...can i buy a used one and have it programed to my 3 keys in case of emergency...I have seen the part 170 820 1826 also described as a control door module...This skreem unit is a lot to understand......i have bought spare cam and crankcase sensors by bosch, and i have a reciept for the rcm replacement from a Chrysler dealer...thank you, Jeff