O ..........
O2Control_ITermHighPort
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky None 100% 902‑4 No 5
Explanation
The fuel system does not appear to be working properly; the PCM received a signal from the oxygen sensor that is valid, but is
higher than expected. The system has added fuel up to its allowable limit.
Possible Causes
• Low fuel rail pressure
• Restricted fuel injectors
• Intake manifold vacuum leak
Summary of Fault Correction Possibilities
• Correct the fuel pressure issues.
• Service the fuel injectors.
• Correct the intake manifold vacuum leak.
O2Control_ITermLowPort
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Sticky None 100% 902‑5 No 5
Explanation
The fuel system does not appear to be working properly; the PCM received a signal from the oxygen sensor that is valid, but is
lower than expected. The system has removed fuel up to its allowable limit.
Possible Causes
• High fuel rail pressure
• Leaking fuel injectors
• Fuel being introduced from another source
Summary of Fault Correction Possibilities
• Correct the fuel rail pressure.
• Service the fuel injectors.
• Investigate the source of the additional fuel.
OilLevelInvalid
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky None 100% 711‑19 No 2
Explanation
The engine oil level could not be determined.
Possible Causes
• Engine temperature too high to read oil level
• Engine trimmed too high to read oil level
Summary of Fault Correction Possibilities
• Allow the engine to cool down.
• Trim the engine down.
Fault Codes
Page 4A-28 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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