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

WARNING: This page does not describe the selected car, but rather 22 other vehicles, including the 2011 Mercury Milan, 2011 Mercury Mariner, 2011 Mercury Grand Marquis, 2011 Lincoln Town Car, and 2011 Lincoln Navigator L. 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 APPROPRIATE SERVICE INFORMATION 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)

Heated Oxygen Sensor-Front (HO2S-Front) Connector

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

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

Courtesy of FORD MOTOR CO.

Heated Oxygen Sensor-Rear (HO2S-Rear) Connector

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

Fig 2: Identifying Heated Oxygen Sensor-Rear (HO2S-Rear) Connector

Courtesy of FORD MOTOR CO.

Powertrain Control Module (PCM) Connector

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

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR PINS REFERENCE CHART

Vehicle	Connector	Pin	Circuit
Crown Victoria, Grand Marquis, Town Car	170 PIN	B35, B36 E28 E69 E29 E70 T24 T47 T25 T48 E58, T41	VPWR HO2S11 HTR11 HO2S21 HTR21 HO2S12 HTR12 HO2S22 HTR22 SIGRTN
E-Series 4.6L, Expedition, Navigator	190-PIN	B67, B68 T16 T18 T20 T48 T40	VPWR HO2S12 HTR12 HO2S22 HTR22 SIGRTN
E-Series 6.8L	170 PIN	B35, B36 E28 E69 E29 E70 T24 T47 T25 T48 B41, E58, T41	VPWR HO2S11 HTR11 HO2S21 HTR21 HO2S12 HTR12 HO2S22 HTR22 SIGRTN
E-Series 5.4L	190-PIN	B67, B68 T16 T18 T20 T48 B58, T40	VPWR HO2S12 HTR12 HO2S22 HTR22 SIGRTN
Edge, MKX	190-PIN	B67, B68 T29 T49 T40 T48 E49	VPWR HO2S12 HTR12 HO2S22 HTR22 SIGRTN
Escape / Mariner 3.0L, Fusion 3.0L, Milan 3.0L	190-PIN	B67, B68 T29 T49 T40 T48 E49, T41	VPWR HO2S12 HTR12 HO2S22 HTR22 SIGRTN
Escape / Mariner 2.5L Manual Transmission, Fusion 2.5L, Milan 2.5L	190-PIN	B67, B68 E8 E69 T29 T49 E49, T41	VPWR HO2S11 HTR11 HO2S12 HTR12 SIGRTN
Escape / Mariner 2.5L Automatic Transmission	190-PIN	B67, B68 T29 T49 T41	VPWR HO2S12 HTR12 SIGRTN
Explorer	190-PIN	B67, B68 T29 T48 T40 T49 E49	VPWR HO2S12 HTR12 HO2S22 HTR22 SIGRTN
F-150 3.7L	190-PIN	B67, B68 T29 T49 T40 T48 T41	VPWR HO2S12 HTR12 HO2S22 HTR22 SIGRTN
F-150 3.5L	198 PIN	B101, B102, B103 B57 B1 B56 B61 B37, B38	VPWR HO2S12 HTR12 HO2S22 HTR22 SIGRTN
F-Series Super Duty 6.8L	190-PIN	B67, B68 T30 T48 T26	VPWR HO2S12 HTR12 SIGRTN
Fiesta	128 PIN	B11, B12, B8 E21 E47 E20 E35 E8, E9	VPWR HO2S11 HTR11 HO2S12 HTR12 SIGRTN
Flex 4V 3.5L, MKS 3.7L, MKT 3.7L, Taurus 4V 3.5L	190-PIN	B51, B52, B53 E23 E1 E24 E2 E58	VPWR HO2S12 HTR12 HO2S22 HTR22 SIGRTN
Flex GTDI 3.5L, MKS 3.5L, MKT 3.5L, Taurus GTDI 3.5L	190-PIN	B35, B36, B51 T29 T48 T40 T49 B56	VPWR HO2S12 HTR12 HO2S22 HTR22 SIGRTN
Focus, Transit Connect	190-PIN	B67, B68 E11 E52 T16 T18 T40	VPWR HO2S11 HTR11 HO2S12 HTR12 SIGRTN
Fusion 3.5L, MKZ	140 PIN	B51, B52 E29 E69 E28 E70 E3 E23 E4 E24 E58	VPWR HO2S11 HTR11 HO2S21 HTR21 HO2S12 HTR12 HO2S22 HTR22 SIGRTN
Mustang 3.7L	190-PIN	B67, B68 T29 T49 T40 T22 T41	VPWR HO2S12 HTR12 HO2S22 HTR22 SIGRTN
Ranger 4.0L	170 PIN	B35, B36 E28 E69 E29 E70 T24 T47 T25 T48	VPWR HO2S11 HTR11 HO2S21 HTR21 HO2S12 HTR12 HO2S22 HTR22
Ranger 2.3L	170 PIN	B35, B36 E28 E69 T24 T47 E58, T41	VPWR HO2S11 HTR11 HO2S12 HTR12 SIGRTN
All other vehicles	190-PIN	B67, B68 T18 T47 T27 T49 T26	VPWR HO2S12 HTR12 HO2S22 HTR22 SIGRTN