Originally posted by ContourColumbus1:
But how can I know if i need the "Sensor located in front manifold/exhaust pipe before catalyst" or the "Downstream sensor, after catalyst" 
You answered this already: Code PO133, Upstream Heated Oxygen Sensor circuit Slow Response - Bank No. 1.
Sounds like Penn Warranty covers mostly hardware problems, but call them up and ask.
"Those who cannot remember the past are condemned to repeat it" -George Santayana
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