fixnair
New Member
Warning! Long post. I have to consult the brain trust on an item that's got me, as well as two repair shops, very frustrated with my 2013 Expedition Limited with 5.4L three valve engine. I've got about 165000 miles on the odo.
About a year ago a heater hose burst and soaked the passenger side of the engine compartment with coolant. After repairing the hoses I had a misfire on #1 cylinder. I replaced the coil to remedy. That day my check engine light came on with codes P0135, 141, 155 and 161. All these codes refer to O2 sensor heater malfunction. I replaced all four of the sensors W/O remedy. Also my fuel mileage took a nosedive from 18 MPG to 13.
Frustrated I took the car to a shop that had good reviews on the internet. I advised them of the events which led to the CEL coming on. As I expected they told me I couldn't use aftermarket O2 sensors so they installed Ford sensors. They also cleaned the intake system with some sort of a pressurized device. Still no remedy. Now they're saying the cats are plugged. The O2 sensor repair cost me $1400 and now they want another $2000 to do the cats. The cats do not inhibit acceleration, it still sets you back in the seats when you hammer it.
The ECU probably got soaked from the heater hose failure being right there on that side of the engine. I'm thinking The ECU is the problem but I hesitate to replace the ECU without some way to confirm my suspicions.
I would appreciate any comments on this issue.
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2007 - 2014 Expedition & Navigator
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About a year ago a heater hose burst and soaked the passenger side of the engine compartment with coolant. After repairing the hoses I had a misfire on #1 cylinder. I replaced the coil to remedy. That day my check engine light came on with codes P0135, 141, 155 and 161. All these codes refer to O2 sensor heater malfunction. I replaced all four of the sensors W/O remedy. Also my fuel mileage took a nosedive from 18 MPG to 13.
Frustrated I took the car to a shop that had good reviews on the internet. I advised them of the events which led to the CEL coming on. As I expected they told me I couldn't use aftermarket O2 sensors so they installed Ford sensors. They also cleaned the intake system with some sort of a pressurized device. Still no remedy. Now they're saying the cats are plugged. The O2 sensor repair cost me $1400 and now they want another $2000 to do the cats. The cats do not inhibit acceleration, it still sets you back in the seats when you hammer it.
The ECU probably got soaked from the heater hose failure being right there on that side of the engine. I'm thinking The ECU is the problem but I hesitate to replace the ECU without some way to confirm my suspicions.
I would appreciate any comments on this issue.
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2007 - 2014 Expedition & Navigator
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