B4000 SE Cab Plus 4WD V6-4.0L OHV (1997)
Oxygen Sensor: Locations
O2 Sensors - Location
HO2S identification is as follows:
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Upstream HO2S on #1 cylinder bank: HO2S 1/1
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Upstream HO2S on opposite bank: HO2S 2/1
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Downstream HO2S: HO2S 1/2
NOTE: No interchangeability between upstream HO2S (green connector) and downstream HO2S (blue connector).