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Discussion Starter #1
I'm driving an 02 Sentra with the 1.8L engine, and I pulled my codes for the check engine light, and got the following...

P0031
H02S Bank 1 Sen 1
Heater Circuit
Low

This thing has 4 oxygen sensors, and I don't know which one it is. Anybody know which one is bank 1 sensor 1??? My best guess is upper left.
 
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