DZ: Universal Heated Oxygen Sensor (HO2S) DZ: Introduction — 2016 workshop reference 5094

Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.

Flex GTDI 3.5L, Focus, Fusion 1.5L, Fusion 2.0L, MKC, MKS 3.5L, MKT 2.0L, MKT 3.5L, MKX 2.0L, MKX 2.7L, MKZ 2.0L, Mustang 2.3L, Navigator, Taurus 2.0L, Taurus GTDI 3.5L, Transit 3.5L, Transit Connect 1.6L
E-Series 6.8L, Explorer 3.5L TiVCT, Explorer 3.7L, F-150 3.5L TiVCT, F-150 5.0L, F-650 / F-750, MKX 3.7L, Motorhome/Stripped Chassis/Step Van, Mustang 3.7L, Mustang 5.0L, Mustang 5.2L, Transit 3.7L, Transit Connect 2.5L	0.55 - 0.75
All others	3.5 - 3.7

Flex GTDI 3.5L, Focus, Fusion 1.5L, Fusion 2.0L, MKC, MKS 3.5L, MKT 2.0L, MKT

3.5L, MKX 2.0L, MKX 2.7L, MKZ 2.0L, Mustang 2.3L, Navigator, Taurus 2.0L, Taurus

GTDI 3.5L, Transit 3.5L, Transit Connect 1.6L

E-Series 6.8L, Explorer 3.5L TiVCT, Explorer 3.7L, F-150 3.5L TiVCT, F-150 5.0L, F-650 / F-750, MKX 3.7L, Motorhome/Stripped Chassis/Step Van, Mustang 3.7L,

Mustang 5.0L, Mustang 5.2L, Transit 3.7L, Transit Connect 2.5L

0.55 -

0.75

All others

3.5 - 3.7

Is the voltage within specification?

Yes	No
INSTALL a new Universal HO2S. REFER to the Workshop Manual Section 303-14, Electronic Engine Controls. RESET the keep alive memory (KAM). REFER to Section 2, Resetting The Keep Alive Memory (KAM). REPEAT the self-test.	For Escape/Kuga 2.5L or Fusion 2.5L symptoms without DTCs, RETURN to Section 3 , Symptom Charts for further direction. For all others, GO to DZ28 .

Yes

INSTALL a new Universal HO2S. REFER to the Workshop Manual Section 303-14, Electronic Engine Controls.

RESET the keep alive memory (KAM). REFER to Section 2, Resetting The Keep Alive Memory (KAM).

REPEAT the self-test.

For Escape/Kuga 2.5L or Fusion 2.5L symptoms without DTCs, RETURN to Section 3 , Symptom Charts for further direction.

For all others, GO to DZ28 .

DZ16 CHECK THE UO2SPC CIRCUIT FOR AN OPEN

• Ignition OFF.

• Universal HO2S connector disconnected.

• PCM connector disconnected.

• Measure the resistance between:

( + ) Universal HO2S Connector, Harness Side	( - ) PCM Connector, Harness Side
UO2SPC	UO2SPC

Is the resistance less than 5 ohms?

Yes	No
INSTALL a new Universal HO2S. REFER to the Workshop Manual Section 303-14, Electronic Engine Controls. RESET the keep alive memory (KAM). REFER to Section 2, Resetting The Keep Alive Memory (KAM).	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

Yes

INSTALL a new Universal HO2S. REFER to the Workshop Manual Section 303-14, Electronic Engine Controls.

RESET the keep alive memory (KAM). REFER to Section 2, Resetting The Keep Alive Memory (KAM).

REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

DZ17 EXHAUST TEMPERATURE OUT OF RANGE

Note: Diagnose all other powertrain related DTCs first.

• Ignition ON, engine running.

• Engine at normal operating temperature.

• Access the PCM and monitor the HTR11 (MODE) and HTR21 (MODE) PIDs.

Are the PID states ON?

Source reference 5094

2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.