darin
New Member
Posts: 2
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Post by darin on Nov 18, 2023 17:15:05 GMT 1
I replaced a leaking water pump on a 2017 Explorer Sport with a 3.5 Ecoboost. Now it throws a P04DB - PCV Pressure sensor disconnected. Apparently it isn't seeing the appropriate pressure reading from the sensor in the PCV line and assumes the sensor or hose is disconnected. The engine seems to be running fine.
I couldn't find anything disconnected and I replaced the PCV pressure sensor, which also comes with the pipe that goes from the front valve cover to a port on the plastic intake pipe. This didn't fix it. I tried replacing the PCV valve but that also did nothing. I don't see anything wrong with any of the air pipes or vacuum lines.
Here's what is odd to me: The code sets immediately upon start-up, as a pending code. The car has to be started multiple times before the light will come on. It seems to me for that code to throw immediately it would have to be something electrical. It sets before there could be any build up of crank-case pressure to detect. Again, the pressure sensor is new (from Ford).
Any ideas? Keep in mind, I did have to remove the intake manifold and both valve covers (along with the timing cover) to replace this water pump.
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Post by chippie on Nov 18, 2023 17:51:01 GMT 1
A thorough check of the wiring for the sensor would be my first...
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Post by rhyds on Nov 18, 2023 18:28:26 GMT 1
Hello and welcome
This is an UK forum and unfortunately we didn't get the 3.5 Ecoboost in the UK, so our specific knowledge may be limited
As chippie says check the actual wiring first, also check you haven't mixed up the pcv sensor connector with one for another circuit nearby
Also, check for an intake, vacuum or pcv system leak. Is live data showing pcv pressure as being low?
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darin
New Member
Posts: 2
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Post by darin on Nov 18, 2023 19:26:08 GMT 1
The live data shows very little pressure registered by the sensor, but I don't know what is normal. The 3 wires to the sensor checked out.
I didn't realize this was a UK oriented site, but thanks for taking the time to answer!
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Post by chippie on Nov 18, 2023 20:49:04 GMT 1
The live data shows very little pressure registered by the sensor, but I don't know what is normal. The 3 wires to the sensor checked out. I didn't realize this was a UK oriented site, but thanks for taking the time to answer! No pressure detected, I’d be checking the pipe work to the sensor then…as far back to the tapping point…
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Post by Karl on Nov 19, 2023 20:09:34 GMT 1
If I get time tomorrow I’ll check Ford PTS for known concerns
Might need something like a PCM update to latest calibration to suit new hardware
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Post by valhalla on Nov 19, 2023 22:00:53 GMT 1
Did you renew the gaskets under the valve-covers - seals between valve-covers and heads? Sounds like there may be an air-leak from the top of the engine. If you have a smoke leak-detector, it would speed things up to pump smoke back up the PCV line to the front valve-cover, and see if any escapes from the valve-cover seals.
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Post by chippie on Nov 20, 2023 17:45:28 GMT 1
I seem to think there was a similar thread with an air issue sometime back? Or is my mind playing tricks?..
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