Oxygen Sensor - Code P-0130

[Tom Sawyer]

Howdy -

re: 2001 S-40, 150k miles on the clock

If I drive slow, short trips to the store, etc. I frequently get the 130 code.
It never happens when I consistently drive over 40 mph.

My OBD reader Live Data will also show:
Fuel Sys 1 OL-Fault

Internet search says:
OL = Open loop. When you start the car till it warms up it runs in the Open loop mode. Meaning it will not monitor the O2 sensors till the car engine warms up enough to get into Closed loop mode (i.e. monitor the air/fuel ratio based on the O2 sensor readings) It could be your OL = Open loop. When you start the car till it warms up it runs in the Open loop mode. Meaning it will not monitor the O2 sensors till the car engine warms up enough to get into Closed loop mode (i.e. monitor the air/fuel ratio based on the O2 sensor readings) It could be your engine coolant sensor is getting bad.

Other than: engine coolant sensor
any other suggestions ?

Thanks in advance,

Tom