Rear oxygen sensor can cause emissions failure on Geo Prizm

Problem Description and Possible Solution
The rear Oxygen sensors are a critical element in fuel control (unlike other vehicles) and can cause an emissions test failure for high CO and HCs. The sensing element cracks and and reports an erroneous steady state lean condition which confuses the engine computer.
Problem Data
RepairPal Verified
Average mileage: (–)
2 model years affected: 1996, 1997
3 people reported this problem
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I had the front changed but the rear is bad and I can't find it