High oil pressure sensor

not sure on a Freightliner but on 2007 volvo with a D12, we had to change the two oil reduction valves to solve a high oil pressure issue. When the key was on Engine off the pressure was 60, start the engine, pressure would jump to 120. In the volvo it has 2 reduction valves and and an oil level / temp sens

 

You need to get a temporary manual gauge in it and see if it’s a mechanical or electrical issue.

If it’s mechanical you’ve got a stuck pressure relief valve oil temp thermostat. Either way let us know what engine your working on if you what any specific answers, otherwise your only going to get generic answers.

 

I am having the same issue with my d13 Volvo 2012, were you able to figure out what the issue was ?

Thanks in advance