how do you replace the ignition lock cylinder assembly, the keys will no longer on 2003 Honda Civic

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can turn the key to get the steering wheel unlocked but not far ebough to start the car
(2) Answers
New key(s) and immobilizer receiver will need to be programmed , OR , before you put the new switch in , have it re-keyed (locksmith) for the CARS ORIGINAL key , AND swap over the receiver ring from original lock.
Not too difficult. Be sure to have a drill, drill bits and a bolt extractor set :