2004 3 door V6 - sudden misfire, OBD port and auto box locked in park. Coincidence?

Car developed a misfire on the way home Monday. I called the AA, he first had issues connecting to the ECU on the OBD port and messed a while until he eventually read some codes. Cam position sensor , TPS and misfire cylinder 5. He couldn’t get the parts so the car was left with just the diagnosis. I ordered the parts and fitted them today. Car starts but still has signs of a misfire. I have tried to connect the reader that I normally use and I can’t establish a connection after trying several times with ignition on or engine on. Also, I tried moving the car but couldn’t shift out of park. I can shift to neutral when the car is off and then select as normal once started though. Are these connected ? Blown fuse ? Or is it a coincidence that the hot weather has fried the car all in one day ?
Read the site many times and found the info here invaluable but first time posting. I think I’ve done it right this time lol

What parts did you fit?
Cam position sensor is a common fault, and prevents the engine from starting, but not running once started. The TPS needs setting up with Land Rover T4 IIRC.
Shifting out of park is likely to be related to the interlock, but how that works depends on what market the vehicle was set up for.