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Emission test failure question also

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Vehicle Information: Year: 1997; Engine (Size, Modifications): Turbo; Total Mileage: 59500;

I read the last response you provided for the failed emission inspection. I have a similar problem, on a I recently purchased 1997 993TT. But the OBDII indicates that several sensors (including the O2 sensor) are "NOT READY". I drove the car on highways for over 100 miles (I understand this sometimes "readies" the sensors) and tried again but the same reply occured. Is the sensor faulty or have I not driven it enough for the sensor to engage properly? Or is there something else I need to do?Thank you for your response.

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