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What was the code? The pre-cat sensors are used to monitor and set the air/fuel mixture ratio so if they are going belly up your mixture could potentially be off which may cause other problems.
What sort of inspection does Texas do? Once you clear your codes you have to drive a certain number of cycles to set your "readiness" flags, and if your O2 sensor is really bad the light will probably come back on during those same drive cycles.
One of the things that the durametric can check is those readiness codes, do they show as ready? If they do you should be all set to go get your inspection.
Steve
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