latly I been getting p0137 off an on. Im running cobb stage 3 OTS maps. I figured that the rear 02 was pretty much shut off.

Maybe its my test pipe? though im using a ETS test pipe and it has the defouller built in....

 

That is something I didn't think about. My car is parked outside. But I know two of the guys here live in an apartment. Even though some apartments have garage's, I really would think that the odds are slim that everyone besides me, parks their car in a garage.

 

Is everyone with the code running AP?

 

One of the guys is also in Oregon and parks his car outside.

I'm just not understanding what causes the issue. And why it will happen to some Evo's, but not others.

If it's about freezing outside, my car does it pretty much 100% of the time

 

I am. My tuner has contacted cobb about the issue as well. But they have not responded.

But a number of the local to me Evo owners also have a cobb ap and their tune is on the cobb like mine

 

Given that metal-on-metal noises from the "front" of the engine are caused by boost-leaks, I'm starting to think that you might have a problem with your power-steering pump.

More seriously, I don't have an AP, but do have an AEM airbox and intake tube. That would be the next variable to include in the search for a common factor. More generally, I'd want to know whether the MAF is inserted into a metal or plastic tube. Hot-wire MAFs are, by definition, more sensitive to temp than, say, a Karmann.

 

I've never thrown this code. I've never had an AP, but I did have an AEM intake on my last X.

 

I got a 2011 Evo X GSR and for the past two days its been 16-20 F outside and I never got any CEL. I live in an apartment so its parked outside. Mods are Topspeed CBE and K&N Drop in filter.

 

And another great theory fails to survive first contact with data....

 

Maybe not. It gets a LOT colder where you are than here.
It was insanely cold this past week, and I did start my car, but from the garage, and didn't take it anywhere.

My AYC pump doesn't do cold or brine. I take the other car.

 

I have an ets intake. It uses the stock maf housing.

If I have a boost leak somewhere, could that cause weird idle behavior and throw the P0134 code?

 

I also use the ETS intake.

Unless some of my coupling connections loosened due to the extreme cold...I am 99% sure I do not have a boost leak.

I am getting the P0134 code, but no idle issues, and the car drives fine. I just clear it and go. Guess I'll find out of there is really something wrong when I take it in tomorrow. I'll post my findings when I get the car back, maybe it will be of some help.

 

As a public service, EvoM has this to say about loose coupling connections in extreme cold:

 

How wildly appropriate haha. Well played.

 

But, IT WAS COOOOOOOOOOOOOOLD!!