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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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Your Northstar 1996 engine has 4 O2 sensors.

Front bank = Bank 2 - Left bank - 2,4,6,8
Rear bank = Bank 1 - Right bank - 1,3,5,7

Sensors are:

B2S1 - Left bank exhaust manifold collector
B1S1 - Top of right exhaust manifold
B1S2 - Pre-cat sensor
B1S3 - After-cat sensor
 
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