What does California smog check fault code p0133p on vw jetta?

P0133 means "Oxygen Sensor Circuit Slow Response (Bank 1, Sensor 1)." Your car may be running rich and using excess fuel. Check the O2 sensors, especially the first O2 sensor before the cat, and check to be sure you don't have any exhaust leaks. I had this code appear once on my 2002 VW Jetta 1.8t, and replacing the front O2 sensor fixed the problem.