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Try a spare key if you have one... Try a little lubricating oil. If that is your original key and it does not turn after lubricating it might be best to seek the services of a GOOD mechanic to replace the cylinder, you do not want it to suddenly lock up again
Radio code has no bearing on the immobiliser at all.
Normally it is down to the key not recognised. Are you using the same / usual key as before? If not then try original or another key as it may be the transponder in the key you are using.
If same key or no joy then remove the lower Black plastic steering cowls on the column (normally 3 or 4 screws) you will expose the barrell assy, on the end of this you'll see the transponder pick up ring. Disconnect from loom, apply silicone grease to pins and reconnect then try starting.
If still no joy, disconnect positive terminal off the battery, touch the lead to an earth point for 2 to 3 seconds to defuse and reset ECU, reconnect and try again.
If still noy joy you will need a garage as special reading equipment is required.
There is usually a light on the instrument cluster that tells you if hte immobiliser has disabled the starter. Something like a key with an X through it or something similar. See if that light is illuminated. If not, check the obvious things like fuses. Jags ignition switches have been known to have a short life span. You may need a new ignition switch and that should be done by a professional mechanic. Good luck.
these motors suffer from dodgy starter contacts on the ignition switch,turn key and all lights on,push car and it starts ok but no starter motor.??these switches are dear as its a complete unit with steering lock,if this is the fault then fit an old fashioned push button switch on dash ---sorted.If you say epc light on then this is immobiliser ,try spare key if that dont work then its a dealer job to reset immobiliser unless someone knows how to by-pass it.Havent done one yet so i dont know how too,but i itching to get my diesel oil covered grimed in black hands on one to try and pit my wit against a four eyed nerd that invented the immobiliser system.