O2 Sensor Bank 1 Sensor 2 Circuit Wiring Diagram (2001-2004 3.0L V6 Ford Escape)

APPLIES TO: This Bank 1 Sensor 2 O2 sensor circuit wiring diagram applies to the following vehicles:

This wiring diagram includes the following circuits:

Fuse 5: Located in the Battery Junction Box, front left corner of engine compartment.
Heated Oxygen Sensor Bank 1 Sensor 2 (HO2S 12): Located on the Y exhaust pipe that connects to the exhaust manifold facing the firewall.

Monitors the efficiency and performance of the catalytic converter that scrubs the exhaust gas of cylinders 1, 2, and 3 (Bank 1).

HO2S Bank 1 Sensor 2 Connector Pinout

Pin	Wire	Description
1	Light blue with orange stripe (LT BLU/ORG)	VPWR –Vehicle Power (12 Volts)
2	White with black stripe (WHT/BLK)	HO2S 12 HEATER –PCM Supplied Ground (heater activation signal)
3	Orange (ORG)	SIG RTN –O2 Sensor Signal Ground
4	Gray with light blue stripe (GRY/LT BLU)	HO2S 12 SIG –O2 Sensor Signal

P0141 DIAGNOSTIC TESTS: The following tutorial will help you test the heater element of the H2OS 12 sensor with a multimeter:

P0141 -O2 Sensor Bank 1 Sensor 2 Heater Tests (2001-2004 3.0L V6 Ford Escape).

You can find a complete list of wiring diagrams and diagnostic test tutorials here:

Here's a sample of the tutorials you'll find there:

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