PINPOINT TEST DW: Heated Oxygen Sensor (HO2S): Introduction

WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Crown Victoria Police Interceptor vehicles equipped with fire suppression system, refer to FIRE SUPPRESSION SYSTEM article for Important Safety Warnings. Failure to follow these instructions may result in personal injury.

WARNING: While conducting tests on a hot engine take all safety precautions to prevent skin contact with hot engine components. Failure to follow these instructions may result in personal injury.

This pinpoint test is intended to diagnose the following:

HO2S/O2S (9F472)
HO2S/O2S (9G444)
harness circuits: HO2S, HO2S Heater, VPWR, and SIGRTN
powertrain control module (PCM) (12A650)

The pin numbering for the connector is in reference to the connector lock tab. Not all connector key combinations are shown

Fig 1: Heated Oxygen Sensor-Front (HO2S-Front) Connector - A

Courtesy of FORD MOTOR CO.

Fig 2: Heated Oxygen Sensor-Front (HO2S-Front) Connector - B

Courtesy of FORD MOTOR CO.

Fig 3: Heated Oxygen Sensor-Front (HO2S-Front) Connector - C

Vehicle	Connector	Pin	Circuit
E-Series, Edge, Escape, F-Super Duty, Freestar/Monterey, Fusion, Mariner, Milan, MKX, MKZ	A	1 3 4 2	VPWR SIGRTN HO2S Signal HO2S Heater
Expedition, Navigator	B	1 3 4 2	VPWR SIGRTN HO2S Signal HO2S Heater
Focus	C	1 3 4 2	VPWR SIGRTN HO2S Signal HO2S Heater
All other vehicles	B	2 4 3 1	VPWR SIGRTN HO2S Signal HO2S Heater

The pin numbering for the connector is in reference to the connector lock tab. Not all connector key combinations are shown

Fig 4: Heated Oxygen Sensor-Rear (HO2S-Rear) Connector - A

Courtesy of FORD MOTOR CO.

Fig 5: Heated Oxygen Sensor-Rear (HO2S-Rear) Connector - B

Courtesy of FORD MOTOR CO.

Fig 6: Heated Oxygen Sensor-Rear (HO2S-Rear) Connector - C

Vehicle	Connector	Pin	Circuit
Escape, F-150, Freestar/Monterey, Mariner, Mark LT	A	1 3 4 2	VPWR SIGRTN HO2S Signal HO2S Heater
Focus	B	1 3 4 2	VPWR SIGRTN HO2S Signal HO2S Heater
All other vehicles	C	2 4 3 1	VPWR SIGRTN HO2S Signal HO2S Heater

Powertrain Control Module (PCM) Connector

For PCM connector views or reference values, refer to the REFERENCE VALUES article.

Vehicle	Connector	Pin	Circuit
E-Series 6.8L, E-Series 5.4L 5R100, F-Super Duty 6.8L	170 Pin	E28 E69 E29 E70 T24 T47 T25 T48 B14 B38 B35 E58, T41	HO2S11 HTR11 HO2S21 HTR21 HO2S12 HTR12 HO2S22 HTR22 HO2S13 HTR13 VPWR SIGRTN
Edge, MKX	190 Pin	E29 E69 E28 E70 E23 E1 E24 E2 B51 E58	HO2S11 HTR11 HO2S21 HTR21 HO2S12 HTR12 HO2S22 HTR22 VPWR SIGRTN
Escape 3.0L, Mariner 3.0L	150 (50-50-50) Pin	E30 E49 E26 E48 T24 T47 T25 T48 B35 E41, T41	HO2S11 HTR11 HO2S21 HTR21 HO2S12 HTR12 HO2S22 HTR22 VPWR SIGRTN
Escape 2.3L, Mariner 2.3L	150 (50-50-50) Pin	E30 E49 T24 T47 B35 E41, T41	HO2S11 HTR11 HO2S12 HTR12 VPWR SIGRTN
Expedition, Navigator	140 Pin	E29 E69 E28 E70 B39 B10 B40 B11 B51 E58	HO2S11 HTR11 HO2S21 HTR21 HO2S12 HTR12 HO2S22 HTR22 VPWR SIGRTN
F-150, Mark LT	190 Pin	E29 E69 E28 E70 T22 T1 T21 T12 B51 E58, T43	HO2S11 HTR11 HO2S21 HTR21 HO2S12 HTR12 HO2S22 HTR22 VPWR SIGRTN
Five Hundred, Freestyle, Montego	150 (50-50-50) Pin	E30 E49 E31 E50 T24 T47 T25 T48 B35 E41, T41	HO2S11 HTR11 HO2S21 HTR21 HO2S12 HTR12 HO2S22 HTR22 VPWR SIGRTN
Focus	150 (50-50-50) Pin	E30 E49 T24 T47 T25 T48 B35 E41, T41	HO2S11 HTR11 HO2S12 HTR12 HO2S13 HTR13 VPWR SIGRTN
Freestar/Monterey, Taurus	104 Pin	60 93 87 94 35 95 61 96 71 91	HO2S11 HTR11 HO2S21 HTR21 HO2S12 HTR12 HO2S22 HTR22 VPWR SIGRTN
Fusion 2.3L PZEV, Milan 2.3L PZEV	140 Pin	E28 E69 E3 E23 E5 E25 B51 E58	HO2S11 HTR11 HO2S12 HTR12 HO2S13 HTR13 VPWR SIGRTN
Fusion 2.3L, Milan 2.3L	140 Pin	E28 E69 E3 E23 B51 E58	HO2S11 HTR11 HO2S12 HTR12 VPWR SIGRTN
Fusion 3.0L, Milan 3.0L, MKZ	140 Pin	E28 E69 E29 E70 E3 E23 E4 E24 B51 E58	HO2S11 HTR11 HO2S21 HTR21 HO2S12 HTR12 HO2S22 HTR22 VPWR SIGRTN
Ranger 2.3L	170 Pin	E28 E69 T24 T47 B35 E58, T41	HO2S11 HTR11 HO2S12 HTR12 VPWR SIGRTN
All other vehicles	170 Pin	E28 E69 E29 E70 T24 T47 T25 T48 B35 E58, T41	HO2S11 HTR11 HO2S21 HTR21 HO2S12 HTR12 HO2S22 HTR22 VPWR SIGRTN