Hey guys. I have read thread after thread. Same codes but different symptoms. I have a 2005 f150 5.4. Rwd. I originally had codes p002 and p0021. Code p002 is now gone. I have an aftermarket cold air intake. No issues for months, so I don't believe that is the cause. Codes came up after an oIL change. I used conventional 5w20. The codes came up and for weeks no performance issues at all. Then I had the reduced engine power warning and the temp Guage would peg. It never over heated, and there was no loss of power or rough idle. That would happen off and on a few times a week.
. I changed both oil control solenoids. The reduces engine power chime went off a few more times for a few weeks. (It hasn't happened the last 2 months) I changed the oil and code p0021 is gone. I still show p0020 though.
So, would it still might be the vct? I've visually inspected the wires for burns and damaged. I haven't checked voltage or anything other than the fuse. Any ideas on what it might be? Or, how to go about diagnosing the issue? Like I've said, there is no performance issues at all. Thanks

 

Since you're getting a code for each of the cam sensors you might have a worn timing chain that's either stretched to the limit or it could've even jumped a tooth.

 

I had the engine replaced last year. I'm not sure if they reused the same chain and assembly. Do you think it still might be that issue, now that it's only showing p0020? The p0021 has since go away.

 

New, used, or remanufactured?
Same year engine or a different year?
If used how many miles on the engine?

 

It was a new engine, 5.4. I'm not sure of the year as it was a direct fit, no new modifications or anything.

 

Then before you do anything I would first talk to those that supplied and installed the engine. There might be some kind of warranty, or if not they might still take care of you just to keep their reputation clean.

 

Thanks. I spoke with them and they said depending on what it is it might be covered. I'm just trying to narrow it down, so I know whether or not I have to pay an outrageous amount. Hoping it was something easy to where I can do it and they don't have to tear into it.

 

That's encouraging, especially if it's something internal that came as part of the engine.