Got a couple of check engine lights today I need your guys help/advice on what to do.
PO156
My code reader said this for this code..
O2 sensor circuit malfunction
Bank 2 sensor 2
The O2 sensor its referring to is the one downstream that monitors emissions and sh!t and has been acting up for a while because the zip tie holding the MIL came off a while back and it fell down onto my x pipe and melted part of it. No biggie, because every 3 or 4 days or so I would get the check engine light and just clear the code. But today I was a little concerned because this one came up... I have no idea what it is or what it means so I was hoping one of you guys could help me out.
P1406
Diagnostic read this...
Manufacturer Control
Auxiliary Emission Controls
So I figured it was something caused by the bad MIL again but I looked it up online just to be sure and found this definition for it... this is the part that I have no idea what its talking about...
Anyways if you guys could help me out with this or give me some information about it I would really appreciate it. Is this a big problem or is it something I can just clear every time it comes up. Should I get it checked out? If its something that is being caused by the bad MIL then I wont worry about it too much for now.
To clarift for others that may have that code. The DPFE sensor regulates EGR flow.
As your looking at the engine from the front, to the right of the throttle body you'll see the DPFE sensor ( EGR position sensor ), there are two hoses attached to it, one you'll see goes to the exhaust, that's your upstream hose. The other is going to the passenger side head, that's the downstream hose. Disconnect that hose and verify that there are no obstructions in the hose or the fitting going to the head.
yeah i talked to the guy at ford and he told me the same thing. but i am a little confused because the problem is not fixed yet there was nothing obstructing the hose when i pulled it off to look through it. is it possible that the sensor is malfunctioning? what else could cause it to throw that particular code? and what exactly would obstruct the flow path of it in the first place if it is just an egr function?
also just a side note... i disconnected the 2 hoses from the sensor and started my car. both of the hoses had air coming out of them when the car was started so nothing is obstructing flow from the hoses. this leads me to believe that its the sensor itself. what do you think mark?
yeah i talked to the guy at ford and he told me the same thing. but i am a little confused because the problem is not fixed yet there was nothing obstructing the hose when i pulled it off to look through it. is it possible that the sensor is malfunctioning? what else could cause it to throw that particular code? and what exactly would obstruct the flow path of it in the first place if it is just an egr function?
also just a side note... i disconnected the 2 hoses from the sensor and started my car. both of the hoses had air coming out of them when the car was started so nothing is obstructing flow from the hoses. this leads me to believe that its the sensor itself. what do you think mark?
yep, then it is the DPFE sensor itself that is bad. It's not uncommon for them to go bad.
k thanks i appreciate it a lot. you know yo shiit man haha. i figured thats what it would be. the guy at ford is an idiot cause he told me they rarely go bad but it didnt make sense to me because when i started the car there was air coming out of both hoses so the only link to the equation in my opinion was a bad sensor. anyways thanks again for your input. you think napa auto could order one of those for me?
k thanks i appreciate it a lot. you know yo shiit man haha. i figured thats what it would be. the guy at ford is an idiot cause he told me they rarely go bad but it didnt make sense to me because when i started the car there was air coming out of both hoses so the only link to the equation in my opinion was a bad sensor. anyways thanks again for your input. you think napa auto could order one of those for me?
Yea, i'm sure they can. If they can, it'll be a GF Sorenson/Standard part.
hmmm.. that wont hurt it at all will it? and what do you mean get rid of it? just plugging it off right? where do i do this at on the manifold right?
Won't hurt a thing. To diable, you'll need to cap the manifold, and block off the intake. You'll also want to mask out the EGR codes in the PCM with a tune.
will do... do i absolutely need a tune to get rid of the codes though or can i just plug everything off for now and clear the check engine code when it comes up every day or two using a diagnostic code reader. is spark advance a factor with egr or is the egr something that is just there for emissions and stuff like that? i know we had a conversation about this a while ago but im just going to listen to you from now on haha. so if i dont "get a tune" but just clear the code every time it comes up will that be ok? for now..
To clarift for others that may have that code. The DPFE sensor regulates EGR flow.
As your looking at the engine from the front, to the right of the throttle body you'll see the DPFE sensor ( EGR position sensor ), there are two hoses attached to it, one you'll see goes to the exhaust, that's your upstream hose. The other is going to the passenger side head, that's the downstream hose. Disconnect that hose and verify that there are no obstructions in the hose or the fitting going to the head.
it senses flow, not regulates the flow. come on now.
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will do... do i absolutely need a tune to get rid of the codes though or can i just plug everything off for now and clear the check engine code when it comes up every day or two using a diagnostic code reader. is spark advance a factor with egr or is the egr something that is just there for emissions and stuff like that? i know we had a conversation about this a while ago but im just going to listen to you from now on haha. so if i dont "get a tune" but just clear the code every time it comes up will that be ok? for now..
the PCM will not retard any spark whatsoever with the EGR disabled.
Check engine light. Need help ASAP! 
