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Case relearn is when the computer has to resync the crank position sensor. It uses the information to detect misfires. The car will run fine without it working properly, but I had that code for months and the SES light which I had to get fixed to pass inspection. I'm not sure about pre OBDII cars but I don't think they use that.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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