2.5mm
Hex Sockets
Sensor
Cover
Oxygen Sensor (RSO2L)
Carbon Monoxide
Sensor (RSCOR)
29
28
Sensor Replacement
SensorVault™ technology prolongs the life
of sensors, but they eventually need to be
replaced When a sensor’s life drops below 5%,
a notification appears during startup to inform
you it’s time to replace it You can view estimated
remaining life at any time in SETTINGS
O2 sensor:
model RSO2L
CO sensor:
model RSCOR
1. Double check which sensor needs to be replaced.
Leave a new sensor in its packaging until you’re ready to install it.
2. Power off CAT85.
3. Use a 2.5mm hex key to remove the two socket head screws on
the sensor cover labeled SENSOR ACCESS.
4. Lift up the bottom of the sensor cover to reveal the gas sensors.
5. Pull the old sensor straight out.
6. Check and remove the new sensor from its packaging.
7. Align and push the new sensor straight in.
The sensor cover won’t close if the sensor is inserted incorrectly.
8. Tilt the sensor cover lip back into place and fasten screws.
9. Power on CAT85 to check sensor life in SETTINGS.
Anything above 95% is normal.
Calibration
Replacement sensors have calibration data
built-in and do not require calibration
