Your vacuum diaphragm(s) are bad which control the blend doors. But first try replacing the vacuum lines which go from the passenger side into firewall. Otherwise, dash has to come out to replace those vacuum diaphragms
It could be many things, bad regulator, bad diode in the alternator, or even a bad ignition switch or even a bad ground. You will need to do some trouble shooting with a multimeter to find the source of your issues. Good Luck and may the force be with you.
My first thought is a map sensor being dirty but that model has so many different sensors it's hard to diagnose. Do you have a repair manual to where the car does a self diagnosis test? Hope this helps....
Make sure your battery has a full charge. Might be the shifter interlock solenoid just doesn't have enough power to release and let the key switch rotate to release the key.
Are these dashboard error codes or are they from a diagnostic scanner? A diagnostic scanner or an OBD2 scanner should have other letters and numbers as part of the code. ( one letter then four numbers).
Check for error codes as sometimes this is caused by the anti theft alarm because it has a low battery and needs replacing. Battery £6.45 from CPC.co.uk or £355 for a replacement alarm!
