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Originally Posted by Gilly
What about the possibilty that the problem is actually one or both of the rear O2 sensors (post-cat diagnostic probe)?
Gilly
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Since the car had been checked by a tech, I presumed the sensor voltages had been checked. Note to self, "stop leaping to conclusions".
In our experience, the cat convertor efficiency codes mean convertor failure virtually every time, but o2 sensor voltages should be checked first, of course.