:help

I just got a check engine light on my ti. The fault code reads "After Cat oxygen sensor heater." I can't find any reference to an oxygen sensor heater in the Bentley manual. Does anyone know what this is refering to?

Thanks

Oxygen sensors need to be warmed up to the proper temp before they start working. Until then, the car runs in a default mode which increases emissions. To minimize the time the car runs in this state, the O2 sensor has a built in heater. That's why there are 4 wires to the sensor. 2 for sensing, and 2 for heating.

Thanks for the help. I'll just get another sensor.