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.
DZ21 CHECK FOR POTENTIAL SENSOR CONTAMINATION CONCERNS
• Investigate the following items as potential sources of universal HO2S contamination:
◾ use of unapproved silicon sealers ◾ fuel contaminated by silicon additives ◾ excessive oil consumption ◾ glycol leaking internally in the engine ◾ lead-contaminated fuel ◾ short drive cycles in cold weather ◾ use of unapproved cleaning agents
Is a concern present?
Yes | No |
|---|---|
REPAIR the source of the contamination. INSTALL a new Universal HO2S. REFER to the Workshop Manual Section 303-14, Electronic Engine Controls. CHANGE the engine oil and oil filter. RESET the keep alive memory (KAM). REFER to Section 2, Resetting The Keep Alive Memory (KAM). REPEAT the self-test. | For DTCs P0133 or P0153, GO to DZ22 . For all others, 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. |
DZ22 CHECK THE UNIVERSAL HO2S RESPONSE TEST RESULTS
• Ignition ON, engine OFF.
• Access the diagnostic monitoring test results for the HO2S11 and HO2S21. Refer to Section 2, Diagnostic Monitoring Test Results Mode 6.
Is the indicated value greater than the minimum threshold?
Yes | No |
|---|---|
Unable to duplicate or identify the concern at this time. Clear the PCM DTCs. REPEAT the self-test. | 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. |
DZ23 CHECK THE UO2SPCT CIRCUIT FOR AN OPEN CIRCUIT
• Ignition OFF.
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.