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Need help with 2 diagnostic codes on a 99 deville.. B1159 and B1155

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Hello to everyone. I'm having some problems figuring out why I have the two codes on my 99 deville d'elegance. I recently replaced both air bags and the air bag module but still have the air bag light on. I also replaced the battery because the old one was not holding a charge. When I checked the codes, they came back as B1155 (calibration mismatch) and B1159 (key data loss). I cleared the codes but the came back on the next time I started the car. I wanted to see if you guys can help me out with some solutions or suggestions. Thanks for all of your help guys.

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