Faulty Oil Pressure Gauge or Sensor?

[nlord2016]

I'll try to keep it short - 2020 GT PP w/ Roush SC. running fresh (literally 0 miles) 5w50. threw a p0521. changed the sensor and code cleared. gauge is still acting odd, though. rev and hold to 3k rpm has gauge gradually rises to 60, then peg. any ideas? wiring harness doesn't look compromised.

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[John S]

That boost gauge also doesn't seem to be responding like it should? Do you still have the original gauge module? I'd try plugging it in and see what happens.

 

[nlord2016]

That boost gauge also doesn't seem to be responding like it should? Do you still have the original gauge module? I'd try plugging it in and see what happens.

Boost gauge has behaved like that from day one. doesn't seem to show any boost unless in motion.

 

[jheissjr]

Why do you think the sensor, gauge and display are giving a false positive? Was the sensor you replaced outputting the wrong output voltage?

 

[nlord2016]

Why do you think the sensor, gauge and display are giving a false positive? Was the sensor you replaced outputting the wrong output voltage?

I'm not familiar with how to test the sensor. it threw the code, so I simply changed it.

 

[Cobra Jet]

Most sensors can be tested off a vehicle with a basic meter by ohm spec’ing it to see if the sensor is within Ford’s recommended spec. I do not know what that spec is, however if the meter test reveals that your reading is MUCH higher or MUCH lower than the Ford spec, usually the sensor is bad,

The specs and walkthrough for testing should be in the Ford Shop Manual, so if anyone on here has one or access to it, they might be able to post the info or at least post images of the pages for testing.

Now, the other thing you can do is remove the sensor from the engine and make sure there is not any debris in the port in screws into. Also clean the end of the sensor, then reinstall and see if that made any difference.

As far as the harness - the harness inside the vehicle, make sure it’s really secured to the gauge cluster. If it’s loose or not making good contact, the gauges will read wrong or inaccurate. Now the harness inside the car behind the dash may be good and look good - but check to make sure any harness beyond what you can see and on that same path is not damaged, loose or that there are not any loose grounds. Loose ground wires can also cause havoc with sensors, dash gauges, etc.

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