I believe there should be 4 fuses, one for each Oxygen sensor so give them all a thorough inspection.
The below information is the best I could capture out of the Mercruiser PCM 112 service manual that fits your fault codes… number 16 indicates Output fault The ECU has detected a problem when trying to output a signal to this.
PCM 112 Fault Tables
Fault
Code | Description | Type Code | Fault Types | Notes |
| 822 | Wideband 02 sensor heater port S1 (precatalyst) | 4 | Range high | This could indicate an extremely high exhaust temperature. If all other faults have been addressed, this indicates a bad sensor. To diagnose, replace the suspect sensor with a known good sensor, or switch the port and starboard sensors to determine if the fault follows the sensor. |
| 5 | Range low | If all other faults have been addressed, this indicates a bad sensor. To diagnose, replace the suspect sensor with a known good sensor, or switch the port and starboard sensors to determine if the fault follows the sensor. | | |
| 16 | Output fault | If all other faults have been addressed, this indicates a bad sensor, a blown fuse, or an issue with the wiring harness. To diagnose, replace the suspect sensor with a known good sensor, or switch the port and starboard sensors to determine if the fault follows the sensor. | | |
| 842 | | 4 | Range high | This could indicate an extremely high e temperature. If all other faults have bee this indicates a bad sensor. To diagnos suspect sensor with a known good sen the port and starboard sensors to deter follows the sensor. |
| Wideband 02 sensor heater starboard S1 (precatalyst) | | | See 16 above | |
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Believe you'll be looking for the 4 as seen as location J,
Mercury MerCruiser Manual Online: Fuses. IMPORTANT: When replacing fuses, always use the same style and current rating as the fuse being replaced. • Fuses of a different style may not operate correctly, providing insufficient circuit protection. • Fuses with a lower current rating will...
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To troubleshoot the fault codes 822-16 and 842-16 on your Mercury 4.5L engine, start by checking the O2 sensor connections and wiring for any damage or corrosion, as loose or faulty connections can trigger these codes. Since the issue returned after a brief absence, it may indicate an intermittent fault or a sensor malfunction. Additionally, inspect the exhaust system for leaks, as they can affect O2 sensor readings. If you've recently changed the oil, ensure it’s at the correct level, as low oil can sometimes cause sensor issues. My younger sister had an essay due for her Sociology class, but she was stuck on how to structure it. I helped her find Academized’s
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