fault code

i have a 2000 kenworth with a 2ws cat check engine light came on and when i did the cruise control check it flash four times paused and six more times does this mean low oil presure it idels on 35 psi and about 70 psi going down the road is that normal thanks charles

 

the code 46 is low oil pressure warning probably bad sensor but may be a broke wire to the sensor

 

thanks were would this sensor be

 

The sensor is behind the oil cooler. Sometimes the wire which runs behind the t-stat housing gets pinched.

 

what is fault code 31 and what can it cause