You need to either buy your own scan tool or find another "guy" to scan your car, Use an independent shop that specialises in european cars. Your Crossfire will scan as a Mercedes 2004 SLK 32 AMG

What were the Diagnostic Trouble Codes, DTC before you changed the coductor plate??

What are the DTC now ? And don't accept some terminology like the speed sensor is bad. GET THE number the DTC exact number.

PS you need to take a look at the Transmission Control Module. The TCM is located where the passengers feet rest. You should pull the carpet back, remove the piece of stryfoam and loosen three black plastic screws to get the steel plate out and you will find the TCU and several other modules there. Look closely for any damage that may have occured because of water getting to the electrical connecters. If you find corrosion or any thing that looks like water has gotten in there you have may found your problem