[denisond3]

I dont know anything about the Oregon emissions tests, but if the Oxygen Sensor heater isnt doing its job, it likely to fail an emissions test. I would check to see if the heater voltage is present - and if it isnt, to see that it does get to the Oxy. Sensor. If the voltage is getting to the Sensor, then a new sensor would be the next think I would fix.

If your car has well over 150k miles on it, and has had problems with running too rich - that could have cause the catalytic converter to overheat; and the ceramic matric might have cracked. But due to the expense of a new cat converter, I would try the Oxygen Sensor fix first.

Good Luck...