SEN
Briggs & Stratton
Engine Sensor Input Fault
Controller displays SEN or SENSOR FAULT and may prevent starting.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed oil pressure, temperature, or speed sensor, Shorted or open sensor wiring harness, Incorrect sensor type installed, Controller analog input failure
How to Fix / Troubleshooting
Safety first: Turn controller to OFF and disconnect battery negative before unplugging sensors.
- Identify sensor: Use the controller manual to determine which sensor is indicated (oil, temp, speed).
- Inspect wiring: Check the harness from the sensor to the controller for chafing, rodent damage, or loose connectors. Repair as needed.
- Test sensor: For simple switches (oil, temp), use a meter to verify open/closed state at room temperature and when engine is warm (if safe). For speed sensors, check resistance against specifications.
- Replace sensor: Install the correct Briggs & Stratton sensor if readings are out of range or intermittent.
- Clear the code: Reconnect battery, cycle controller to OFF then AUTO, and test operation.
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Repair Difficulty
Medium
3/5
Required Part
Oil Pressure Switch
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