Codes po452 and po453

It's on top of the fuel sending unit. You have to remove the tank to replace it.

Well ---PO 452 is still FTP Sensor Circuit Low Voltage Detected
new sensor or not



If the sensor reads less than .22volts with key on /engine off --you get a hard fault (code)


Check Sensor Connector


Sensor with no pressure or vacuum in tank is 2.4 to 2.8 volts
Key On/Eng Off On scan tool PIDS


You just need a shop with a data base & proper test procedure
or a different tech or different dealer.


I have the 2004 gas engine emissions diagnostic manual for all
2004 fords, as I have a Lincoln LS,so I don't know why a pro
couldn't resolve

(PO452 general motors code, low evaporative emmisions control input) Believe it or not it could be that the gas cap is not on tight or needs to be replaced. Other than that: vacuum line or evap. canister leak.

This code has to do with the EVAP system and not the fuel pressure. The first thing to do is make sure your gas cap is tight. If this does not solve the problem, you will have to have the truck diagnosed by a qualified technician with a proper scan tool.

sorry there, your question is a little confusing

your code PO452 comes up............Evaporative emission control system, pressure sensor low imput.

ABS -- is one problem
Possible Wheel Speed Sensor ,but
you can't guess Use codes & other
resouces to diagnose

EVAP System Code PO452 -- may be a
Pressure Sensor issue ,all I have is Low Input
I assume that means high resistance in the solenoid coil,
thus low voltage detected
Again- need scanner & evap smoke machine ,to check out,
unless your guy shot guns common items & gets lucky at
your expense,changing parts

You should have 3 grounds 1 from the battery to the engine one from the engine to the body and then from the engine to the frame. Look for these grounds they look like braided flat wire. I think you also may have a loose plug or a cut in the main harness from the rear of the vehicle. Look along the frame as the harness runs from back to front. Looking at your codes I do not think they are related to your electrical problem. I gave up trying to fix my gear indicator, I had to replace the fuel tank sensor to get my gas gage working right.

CODE PO452 FUEL TANK PRESSURE SENSOR CIRCUIT LOW INPUT CONDITIONS.YOUR FTP OR FUEL TANK PRESSURE SENSOR FAILED. PO651 5 VOLT REFERENCE 2 CIRCUIT MALFUNCTION CONDITIONS.POSSIBLE CAUSE 5 VOLT REF.CIRCUIT IS SHORTED TO CHASSIS OR SENSOR GROUND.OR 5 VOLT REF CIRCUIT TO MAP OR TP SENSORS CIRCUIT IS SHORTED TO B+.ALSO YOUR PCM HAS FAILED.YOU PROBABLY NEED TO TAKE IT TO DEALERSHIP.THEY HAVE DIAGNOSTIC EQUIPMENT TO CHECK SENSORS AND PCM FAILURE.

you might try unhooking the battiey for 20min both + and - posties cuz that will force the computor to have to resest only if you have addressied the fuel pressure problem which taht would most likly be your filter which isn't all that much