Why does my check engine light keep coming on? 2006 Ford F250 Super Duty?

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Richard S

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Ford has had some O2 sensor problems in the past and it was related to the heated O2 sensors and a wiring issue. I was able to find three TSB's = Technical Service Bulletins that pertained to O2 sensor problems. Suggest that you contact your local dealership and ask if there are any TSB's that apply to your particular vehicle.
 
The check engine light came on saying basically the upstream O2 sensor was bad. So I replaced all four O2 sensors. After the code was cleared - the check engine light came back on after I refueled the truck. I had the code cleared again - but it just came back on for the bank one O2 sensor.

Is it something else entirely?
Well.. I had an ASE mechanic do the trouble shooting so it's not just my random musings coming up with the code. And also keep going back to a very reputable parts store here in town for help. They even offered to change out the O2 sensors for free with new ones since I just bought the sensors there.

It's out of warranty (high miles) so no issue voiding anything there.

I did consider that it quite possibly needs new spark plugs due there is a "shudder" in the engine at some points.

Thanks so far!!!
 
Probably a sensor take it to Auto-Zone and have them hook it up for you its free
 
O2 Sensor? Probably NOT the problem.
People like to blame the O2 sensor for the problem because that's where the computer fault appears.
However, nine times out of ten, it's not faulty. It is simply reading a condition in the engine that is causing it to send a signal to the computer that there is a fault in the exhaust emissions mixture.
A fouled spark plug, loose spark plug wire, a vacuum leak, dirty injectors, EGR valve, weak fuel pump, dirty fuel filter, weak ignition coil, plugged air filter, on and on, can all cause the O2 sensor to register a fault code.
Before you yank the O2 sensor and replace it, check the basics first. Otherwise, you could have wasted time and money on the result, not the cause.

ADDED:
(Check Engine Light)
There are many components that work together in the engine to maintain optimal engine performance and economy.
A "check engine" light indicates that there is a sensor that is reading a condition that is "out of range".
Simply resetting the light does not solve the initial cause of the problem.
Replacing a number of parts trying to troubleshoot the problem in the hopes of getting the light to stay off is a tremendous waste of time and money.
The simplest, and most economical way to alleviate your issue, is to have an engine diagnostic done by a reputable shop to determine what caused the computer to signal you to begin with. Just reading the computer codes may not find the "cause".
That being said, if per-chance you feel the need to reset the light in the hopes that it was a "glitch" of some kind, you could disconnect the negative battery terminal for a couple of minutes to clear the check engine light. (ignition key turned on)
 
b.c it's a FORD! lol



but really, it's just a little mistake that came up probably when you got your oil change
just go to the jiffylube or any oil place and tell them you had your car there about a week ago and the light never turned off (they will never check if you were actually there) and it literally takes 5 seconds to do it
 
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