Summary of Fault Correction Possibilities
• Check the O2 sensor fuse. If open, locate the source of the excess current draw. Replace the fuse.
• Inspect the O2 sensor wiring for an open or short, repair as necessary.
• Replace the O2 sensor.
UEGO1_HtrOpnShrt
Fault Type: Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky None 100% 822‑16 No 2
Explanation
The oxygen (O2) sensor does not appear to be working properly; the PCM detected a problem when trying to send a signal to
the O2 sensor heater.
Possible Causes
• O2 sensor fuse failed
• Wiring problem
• O2 sensor failed
Summary of Fault Correction Possibilities
• Check the O2 sensor fuse. If open, locate the source of the excess current draw. Replace the fuse.
• Inspect the O2 sensor wiring for an open or short, repair as necessary.
• Replace the O2 sensor.
UEGO1_HtrUprLimit
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky None 100% 822‑4 No 2
Explanation
The oxygen (O2) sensor does not appear to be working properly; the PCM received a signal that is valid, but is higher than
expected. The O2 sensor is getting too hot.
Possible Causes
• O2 sensor fuse failed
• Wiring problem
• O2 sensor failed
Summary of Fault Correction Possibilities
• Check the O2 sensor fuse. If open, locate the source of the excess current draw. Replace the fuse.
• Inspect the O2 sensor wiring for an open or short, repair as necessary.
• Replace the O2 sensor.
UEGO1_Sensor_Open
Fault Type:
Horn: Guardian: UFC: Transmission to Helm: Freeze Frame Priority:
Nonsticky None 100% 821‑1 No 2
Explanation
The oxygen (O2) sensor does not appear to be working properly; the output circuit from the PCM to the O2 sensor is open or
has too much resistance.
Possible Causes
• O2 sensor fuse failed
• Wiring problem
Fault Codes
90-8M0146617 eng JULY 2018 © 2018 Mercury Marine Page 4A-45
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