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:
Nonsticky
None
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:
Nonsticky
None
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:
Nonsticky
None
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
90-8M0146617 eng JULY 2018
Guardian:
UFC:
100%
822‑16
Guardian:
UFC:
100%
822‑4
Guardian:
UFC:
100%
821‑1
Transmission to Helm:
No
Transmission to Helm:
No
Transmission to Helm:
No
© 2018 Mercury Marine
Fault Codes
Freeze Frame Priority:
2
Freeze Frame Priority:
2
Freeze Frame Priority:
2
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