Code p0174 refers to system too lean bank 2===causes intake/exhaust leak---fuel pressure /pump---injector/s---AIR system---hose connection/s
the transmission oil in the coolant will be from a failed transmission cooler in the radiator tank ( perils of fitting anything but brand new out of the box radiators.)
you have to completely flush out the cooling system as the oil in the system will affect the ability of the coolant to cool the engine
It is also possible that there will be coolant in the transmission as when the pump pressure is lost from stopping the engine ,the radiator pressure will force water back into the transmission.
SOURCE: 1999 lincoln navigator obd code p0455
Either the fuel cap, or the evap solenoid on the charcoal canister. I'd start with the fuel cap.
SOURCE: 2004 Lincoln navigator misfire on cylinder 8 error code p318
Replace the coil pack once more. I went through 2 new ones on my f150 on one cylinder. One worked, the other didn't (both new off the shelf). Condensation build up in the boot caused mine to misfire. Anytime you replace a coil pack, squirt a little silicone grease inside. This will prevent condensation from hitting your plug. Fords are notorius for this problem, especially if you live in a humid area. Also, make sure and clear the codes after you make the repair.
SOURCE: 03 Mazda 6: Check engine light on, code po174
The oil pressure sensor does not have much to do with the P0174 code so the leak on the gasket is not the cause, usually it is the air mass sensor, or the intake sensor. if you have a leak of oil, this might as well mean that whoever changed the oil did not put the right specs of it and this caused the oil to get through. After some time you will experience that the rpms will reach only certain level and won't go higher. Change oil to the right specs and get the sensor cleaned if not to late or replaced (will be expensive). Gasket change wil be needed as well.
SOURCE: 2000 Lincoln Navigator with rough idling and service engine light
i had the same trouble, there is a rubber boot under the cover on the top of the motor, it is coming from the egr valve, takes about 5 mins to repair and less than 5 dollars.
SOURCE: Codes P0171, and P0174 bLean on a 98 Navigator. Any ideas?
mass air flow sensor is not the problem, I had the exact same problem and have done much research on this. Check the PVC rubber hoses, especially the elbows for cracks. You probably noticed your gas mileage has been horrible too. Hope this helps
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Thanks bill, now i just had my fuel pump replaced also to flush the cooling system ill have to disconnect the hose at the bottom of the radiator as well as the thermostat?
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