Hello and Welcome! I'm Billy and i will assist you with your inquiry. Feel free to ask if any further info is needed.
To check or replace the steering lock, the ignition switch needs removing.
After refitting the ignition switch, the theft deterrent system requires reprogramming, or the engine will no longer start.
So i'm afraid that this needs to be tackled by a garage having a TechII scan tool (any Isuzu or GM specialist, not necessarily dealer).
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