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Afshin,
How much higher was the HC count? Was it close to the max limit or just higher then before? In my experience, the most common reason for high HC is a cool catalytic converter. For instance, if the smog station you went to is close to your home AND you had to wait a while before they actually tested it. The cat needs to be fully warmed up to work correctly. I recommend a good 20 minutes of sustained (freeway) driving before pulling into the emissions testing shop. And if you need to wait more than 10 to 15 minutes, make sure the car idles for a while before they take measurements.
The next most common problem is a degraded O2 sensor.
Anyway...what were your actual numbers vs. the previous test vs. the max limit?
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