I bought this truck back in August. It's now saying the oil pressure is low but there's more than enough oil in it. I added an extra quart to see if that would get the sensor to turn off. The car has 155k miles on it.
Also, the tire pressure sensor keeps coming on even though the tires are inflated properly. Any ideas on how to get that to turn off?
This is in the wrong model year forum, someone likely will be doing to fix it.
The oil pressure could be the sensor, the screen below the sensor, or as Swathdiver pointed out the pickup tube o-ring. To test that O-ring, some park the truck face down on a hill (or steep driveway) and make sure it is 2 qts overfilled. When running in that state, if the pressure returns to normal, then the O-Ring is bad and need replacing.
I would replace the sensor and screen first. There are YouTube videos showing how to do it. Without watching the how to clips in YouTube, unless you are a very experienced mechanic, it is going to seem really difficult.
Take it to a tire shop, they can find the bad sensor and relearn/replace it for you. If one tire pressure sensor is bad and you don’t have records showing them being replaced fairly recently, set some money aside for replacing all of them pretty soon.