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Remove the oil sender unit and fit a pressure gauge , start the engine and check pressure, seems odd the oil light and pressure gauge both showed a fault at the same time, perhaps the oil pump relief valve stuck open for a short time.
start by checking the ground strap to the engine, and engine to body. The oil pressure sender unit may be bad. You may have to hook up an oil pressure gauge to the oil pressure sender port to verify proper oil pressure. Senders are cheap- I would just replace it and go from there.
have a 2004 ford f150 with a 5.4L. While the truck would sit and idle my temp gauge would go to zero and the check gauge and check engine light would come on. Ran the codes and got P1289. Cleared the codes and truck would do fine for a few days and then it would happen again while sitting and idling. I replaced the CHT sensor and cranked the truck. The check gauge light can on and got the P1289 code. Replaced the CHT again(thinking the new one was bad) and cleared the codes. Cranked the truck again and it did the same thing. Cleared the codes and the check gauge light and check engine light would come back on with the motor running. When the motor is warmed up, I turned on the key on without cranking the motor, the temp gauge works, when the motor is cranked and running, the temp gauge goes to zero and the the ckeck gauge light on back on and gives the P1289 code. Does any one have any ideas on what to do
A faulty temperature sending unit. It should be located on or near the thermostat housing. If any of your gauges reads zero, the check gauges light will come on. Sometimes even if the fuel gauge gets too low, it will trigger the light. It may be the connection at the sending unit. It may have become loose so wiggle it and make sure it is securely connected to the sending unit. If the temp. gauge needle pegs at the top of the gauge, it means the sending unit has grounded out and is faulty. If it jumps, reads off or not at all it could be a faulty sender or a bad connection.
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