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JFP and others are right. If your sensor voltages are in spec and your read O2 readings are sine waves instead of essentially flat, your cats are cooked.
CA no longer does a tailpipe test for '00 and later cars. To pass, your CEL must be off, your monitoring systems should be ready, and I believe you mustn't have and stored emission codes.
If you have a Durametric, check the O2 sensor voltages to confirm the problem. A few days before testing, clear CEL and stored codes. Drive the car several times until the monitoring systems reset. Then get the car tested.
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