after crash repair the engine fails to keep running after instantly starting why

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A low speed front end crash with driver airbag deployment took out most plastic, sheet metal, right side light, radiator and fan. However, engine, frame, steering all look ok and repairs were all bolt on with no problems, except I have not replaced the air bag yet. I am trying to get it started, all the instrument panel lights come on and the engine fires up instantly but quickly dies. I have read about having to clear "crash codes" from the computer or resetting a fuel shutoff which I cannot find --- any ideas ????