02 sensor designator

GTSlookin

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Tried search with no luck on this and was hoping someone has figured this out. I am getting code P0155 2/1 failed heater element.
The 2 means downstream but can not find in the manual which side the 1 means.
Anybody??
 
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GTSlookin

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The culprit. Got caught up around engine mount somehow and sliced one wire. Was out at local track three weeks ago. Finally worked it's way through.
 

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